这里是sql语句的索引
SQL语句集锦
--语 句 功 能
--数据操作
SELECT --从数据库表中检索数据行和列
INSERT --向数据库表添加新数据行
DELETE --从数据库表中删除数据行
UPDATE --更新数据库表中的数据
--数据定义
CREATE TABLE --创建一个数据库表
DROP TABLE --从数据库中删除表
ALTER TABLE --修改数据库表结构
CREATE VIEW --创建一个视图
DROP VIEW --从数据库中删除视图
CREATE INDEX --为数据库表创建一个索引
DROP INDEX --从数据库中删除索引
CREATE PROCEDURE --创建一个存储过程
DROP PROCEDURE --从数据库中删除存储过程
CREATE TRIGGER --创建一个触发器
DROP TRIGGER --从数据库中删除触发器
CREATE SCHEMA --向数据库添加一个新模式
DROP SCHEMA --从数据库中删除一个模式
CREATE DOMAIN --创建一个数据值域
ALTER DOMAIN --改变域定义
DROP DOMAIN --从数据库中删除一个域
--数据控制
GRANT --授予用户访问权限
DENY --拒绝用户访问
REVOKE --解除用户访问权限
--事务控制
COMMIT --结束当前事务
ROLLBACK --中止当前事务
SET TRANSACTION --定义当前事务数据访问特征
--程序化SQL
DECLARE --为查询设定游标
EXPLAN --为查询描述数据访问计划
OPEN --检索查询结果打开一个游标
FETCH --检索一行查询结果
CLOSE --关闭游标
PREPARE --为动态执行准备SQL 语句
EXECUTE --动态地执行SQL 语句
DESCRIBE --描述准备好的查询
---局部变量
declare @id char(10)
--set @id = '10010001'
select @id = '10010001'
---全局变量
---必须以@@开头
--IF ELSE
declare @x int @y int @z int
select @x = 1 @y = 2 @z=3
if @x > @y
print 'x > y' --打印字符串'x > y'
else if @y > @z
print 'y > z'
else print 'z > y'
--CASE
use pangu
update employee
set e_wage =
case
when job_level = ’1’ then e_wage*1.08
when job_level = ’2’ then e_wage*1.07
when job_level = ’3’ then e_wage*1.06
else e_wage*1.05
end
--WHILE CONTINUE BREAK
declare @x int @y int @c int
select @x = 1 @y=1
while @x < 3
begin
print @x --打印变量x 的值
while @y < 3
begin
select @c = 100*@x + @y
print @c --打印变量c 的值
select @y = @y + 1
end
select @x = @x + 1
select @y = 1
end
--WAITFOR
--例 等待1 小时2 分零3 秒后才执行SELECT 语句
waitfor delay ’01:02:03’
select * from employee
--例 等到晚上11 点零8 分后才执行SELECT 语句
waitfor time ’23:08:00’
select * from employee
***SELECT***
select *(列名) from table_name(表名) where column_name operator value
ex:(宿主)
select * from stock_information where stockid = str(nid)
stockname = 'str_name'
stockname like '% find this %'
stockname like '[a-zA-Z]%' --------- ([]指定值的范围)
stockname like '[^F-M]%' --------- (^排除指定范围)
--------- 只能在使用like关键字的where子句中使用通配符)
or stockpath = 'stock_path'
or stocknumber < 1000
and stockindex = 24
not stock*** = 'man'
stocknumber between 20 and 100
stocknumber in(10,20,30)
order by stockid desc(asc) --------- 排序，desc-降序，asc-升序
order by 1,2 --------- by列号
stockname = (select stockname from stock_information where stockid = 4)
--------- 子查询
--------- 除非能确保内层select只返回一个行的值，
--------- 否则应在外层where子句中用一个in限定符
select distinct column_name form table_name --------- distinct指定检索独有的列值，不重复
select stocknumber ,"stocknumber + 10" = stocknumber + 10 from table_name
select stockname , "stocknumber" = count(*) from table_name group by stockname
--------- group by 将表按行分组,指定列中有相同的值
having count(*) = 2 --------- having选定指定的组
select *
from table1, table2
where table1.id *= table2.id -------- 左外部连接，table1中有的而table2中没有得以null表示
table1.id =* table2.id -------- 右外部连接
select stockname from table1
union [all] ----- union合并查询结果集，all-保留重复行
select stockname from table2
***insert***
insert into table_name (Stock_name,Stock_number) value ("xxx","xxxx")
value (select Stockname , Stocknumber from Stock_table2)---value为select语句
***update***
update table_name set Stockname = "xxx" [where Stockid = 3]
Stockname = default
Stockname = null
Stocknumber = Stockname + 4
***delete***
delete from table_name where Stockid = 3
truncate table_name ----------- 删除表中所有行，仍保持表的完整性
drop table table_name --------------- 完全删除表
***alter table*** --- 修改数据库表结构
alter table database.owner.table_name add column_name char(2) null .....
sp_help table_name ---- 显示表已有特征
create table table_name (name char(20), age smallint, lname varchar(30))
insert into table_name select ......... ----- 实现删除列的方法（创建新表）
alter table table_name drop constraint Stockname_default ---- 删除Stockname的default约束
***function(/*常用函数*/)***
----统计函数----
AVG --求平均值
COUNT --统计数目
MAX --求最大值
MIN --求最小值
SUM --求和
--AVG
use pangu
select avg(e_wage) as dept_avgWage
from employee
group by dept_id
--MAX
--求工资最高的员工姓名
use pangu
select e_name
from employee
where e_wage =
(select max(e_wage)
from employee)
--STDEV()
--STDEV()函数返回表达式中所有数据的标准差
--STDEVP()
--STDEVP()函数返回总体标准差
--VAR()
--VAR()函数返回表达式中所有值的统计变异数
--VARP()
--VARP()函数返回总体变异数
----算术函数----
/***三角函数***/
SIN(float_expression) --返回以弧度表示的角的正弦
COS(float_expression) --返回以弧度表示的角的余弦
TAN(float_expression) --返回以弧度表示的角的正切
COT(float_expression) --返回以弧度表示的角的余切
/***反三角函数***/
ASIN(float_expression) --返回正弦是FLOAT 值的以弧度表示的角
ACOS(float_expression) --返回余弦是FLOAT 值的以弧度表示的角
ATAN(float_expression) --返回正切是FLOAT 值的以弧度表示的角
ATAN2(float_expression1,float_expression2)
--返回正切是float_expression1 /float_expres-sion2的以弧度表示的角
DEGREES(numeric_expression)
--把弧度转换为角度返回与表达式相同的数据类型可为
--INTEGER/MONEY/REAL/FLOAT 类型
RADIANS(numeric_expression) --把角度转换为弧度返回与表达式相同的数据类型可为
--INTEGER/MONEY/REAL/FLOAT 类型
EXP(float_expression) --返回表达式的指数值
LOG(float_expression) --返回表达式的自然对数值
LOG10(float_expression)--返回表达式的以10 为底的对数值
SQRT(float_expression) --返回表达式的平方根
/***取近似值函数***/
CEILING(numeric_expression) --返回>=表达式的最小整数返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
FLOOR(numeric_expression) --返回<=表达式的最小整数返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
ROUND(numeric_expression) --返回以integer_expression 为精度的四舍五入值返回的数据
--类型与表达式相同可为INTEGER/MONEY/REAL/FLOAT 类型
ABS(numeric_expression) --返回表达式的绝对值返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
SIGN(numeric_expression) --测试参数的正负号返回0 零值1 正数或-1 负数返回的数据类型
--与表达式相同可为INTEGER/MONEY/REAL/FLOAT 类型
PI() --返回值为π 即3.1415926535897936
RAND([integer_expression]) --用任选的[integer_expression]做种子值得出0-1 间的随机浮点数
----字符串函数----
ASCII() --函数返回字符表达式最左端字符的ASCII 码值
CHAR() --函数用于将ASCII 码转换为字符
--如果没有输入0 ~ 255 之间的ASCII 码值CHAR 函数会返回一个NULL 值
LOWER() --函数把字符串全部转换为小写
UPPER() --函数把字符串全部转换为大写
STR() --函数把数值型数据转换为字符型数据
LTRIM() --函数把字符串头部的空格去掉
RTRIM() --函数把字符串尾部的空格去掉
LEFT(),RIGHT(),SUBSTRING() --函数返回部分字符串
CHARINDEX(),PATINDEX() --函数返回字符串中某个指定的子串出现的开始位置
SOUNDEX() --函数返回一个四位字符码
--SOUNDEX函数可用来查找声音相似的字符串但SOUNDEX函数对数字和汉字均只返回0 值
DIFFERENCE() --函数返回由SOUNDEX 函数返回的两个字符表达式的值的差异
--0 两个SOUNDEX 函数返回值的第一个字符不同
--1 两个SOUNDEX 函数返回值的第一个字符相同
--2 两个SOUNDEX 函数返回值的第一二个字符相同
--3 两个SOUNDEX 函数返回值的第一二三个字符相同
--4 两个SOUNDEX 函数返回值完全相同
QUOTENAME() --函数返回被特定字符括起来的字符串
/*select quotename('abc', '{') quotename('abc')
运行结果如下
----------------------------------{
{abc} [abc]*/
REPLICATE() --函数返回一个重复character_expression 指定次数的字符串
/*select replicate('abc', 3) replicate( 'abc', -2)
运行结果如下
----------- -----------
abcabcabc NULL*/
REVERSE() --函数将指定的字符串的字符排列顺序颠倒
REPLACE() --函数返回被替换了指定子串的字符串
/*select replace('abc123g', '123', 'def')
运行结果如下
----------- -----------
abcdefg*/
SPACE() --函数返回一个有指定长度的空白字符串
STUFF() --函数用另一子串替换字符串指定位置长度的子串
----数据类型转换函数----
CAST() 函数语法如下
CAST() (<expression> AS <data_ type>[ length ])
CONVERT() 函数语法如下
CONVERT() (<data_ type>[ length ], <expression> [, style])
select cast(100+99 as char) convert(varchar(12), getdate())
运行结果如下
------------------------------ ------------
199 Jan 15 2000
----日期函数----
DAY() --函数返回date_expression 中的日期值
MONTH() --函数返回date_expression 中的月份值
YEAR() --函数返回date_expression 中的年份值
DATEADD(<datepart> ,<number> ,<date>)
--函数返回指定日期date 加上指定的额外日期间隔number 产生的新日期
DATEDIFF(<datepart> ,<number> ,<date>)
--函数返回两个指定日期在datepart 方面的不同之处
DATENAME(<datepart> , <date>) --函数以字符串的形式返回日期的指定部分
DATEPART(<datepart> , <date>) --函数以整数值的形式返回日期的指定部分
GETDATE() --函数以DATETIME 的缺省格式返回系统当前的日期和时间
----系统函数----
APP_NAME() --函数返回当前执行的应用程序的名称
COALESCE() --函数返回众多表达式中第一个非NULL 表达式的值
COL_LENGTH(<'table_name'>, <'column_name'>) --函数返回表中指定字段的长度值
COL_NAME(<table_id>, <column_id>) --函数返回表中指定字段的名称即列名
DATALENGTH() --函数返回数据表达式的数据的实际长度
DB_ID(['database_name']) --函数返回数据库的编号
DB_NAME(database_id) --函数返回数据库的名称
HOST_ID() --函数返回服务器端计算机的名称
HOST_NAME() --函数返回服务器端计算机的名称
IDENTITY(<data_type>[, seed increment]) [AS column_name])
--IDENTITY() 函数只在SELECT INTO 语句中使用用于插入一个identity column列到新表中
/*select identity(int, 1, 1) as column_name
into newtable
from oldtable*/
ISDATE() --函数判断所给定的表达式是否为合理日期
ISNULL(<check_expression>, <replacement_value>) --函数将表达式中的NULL 值用指定值替换
ISNUMERIC() --函数判断所给定的表达式是否为合理的数值
NEWID() --函数返回一个UNIQUEIDENTIFIER 类型的数值
NULLIF(<expression1>, <expression2>)
--NULLIF 函数在expression1 与expression2 相等时返回NULL 值若不相等时则返回expression1 的值
精妙SQL语句
说明：复制表(只复制结构,源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
说明：拷贝表(拷贝数据,源表名：a 目标表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
说明：显示文章、提交人和最后回复时间
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
说明：外连接查询(表名1：a 表名2：b)
SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c
说明：日程安排提前五分钟提醒
SQL: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5
说明：两张关联表，删除主表中已经在副表中没有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
说明：--
SQL:
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
FROM TABLE1,
(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE, 'YYYY/MM')) X,
(SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM') || '/01','YYYY/MM/DD') - 1, 'YYYY/MM') ) Y,
WHERE X.NUM = Y.NUM （+）
AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B
WHERE A.NUM = B.NUM
说明：--
SQL:
select * from studentinfo where not exists (select * from student where studentinfo.id=student.id) and 系名称='"& strdepartmentname&"' and 专业名称='"&strprofessionname& "' order by 性别,生源地,高考总成绩
说明：
从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源）
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
FROM TELFEESTAND a, TELFEE b
WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy')
说明：四表联查问题：
SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
说明：得到表中最小的未使用的ID号
SQL:
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)
: 我在ms sql中建了一个表,可由于种种原因有些记录重复了
: 记录完全的一模一样。
: 现在我想把重复的都删掉,只保留重复记录中的第一条。
: 我在database好象看到有介绍oracle的，
select distinct * into #table_name from table_name
delete from table_name
select * into table_name from #table_name
drop table #table_name
与此相关的是“select into”选项，可以在数据库属性
对话框中，勾起来此项，或者在Query Analyzer中执行
execute sp_dboption 'db_name','select into','true'
开启。默认值是关闭的。
SQL:SELECT NEWID()
自连接取出荣于数据
把所有姓名相同的只取出一个
select a.name from table_name a where a.id in
(select b.id from table_name b where a.id<>b.id)
同理删除荣誉数据
delete from table_name where table_name.id in
(select b.id from table_name b where table_name.id<>b.id)
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
选择在每一组b值相同的数据中对应的a最大的(换成average或别的函数或子查询,你会有意想不到的发现)记录的所有信息.
类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.
上面的许多同志对子查询存在有偏见与误解,其实在一个好的数据分析程序中,子查询可以简化很多程序逻辑.
获益不浅啊.
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
:)
cpp2017(长安不见使人愁)这么长一句，少见，能否介绍介绍它的功力？^_^
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
pwdencrypt
密码加密？
有些什么作用，不明白
随机取出10条数据
select top 10 * from tablename order by newid()
功能：
type vender pcs
电脑 A 1
电脑 A 1
光盘 B 2
光盘 A 2
手机 B 3
手机 C 3
select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type
Microsoft SQL Server是如何加密口令的？未公开的加密函数？
如果对MSSQL的用户信息有兴趣的，可能会发现master.dbo.sysxlogins里面存放着用户的口令，可是呢，password字段如果不是null就是一堆看不懂的binary，这个口令是怎么加密的呢？
其实只要仔细看看master.dbo.sp_addlogin就知道了，MSSQL的sp都可以看到代码，真是不错。
让我们来看看它是怎么做的，注意这一行select @passwd = pwdencrypt(@passwd)，这个时后@passwd就被加密了，让我们也来试一下
DECLARE @ClearPWD varchar(255)
DECLARE @EncryptedPWD varbinary(255)
SELECT @ClearPWD = 'test'
SELECT @EncryptedPWD = CONVERT(varbinary(255), pwdencrypt(@ClearPWD))
SELECT @EncryptedPWD
看上去不错，确实被加密了，可是我怎么还原呢？
呵呵，这就没戏了，口令加密都是单向的，用加密后的密文来比较就可以了。
继续看看其它用户相关的sp，可以发现master.dbo.sp_password里面有口令比较的内容。
pwdcompare(@old, password, (CASE WHEN xstatus&2048 = 2048 THEN 1 ELSE 0 END))
不用去理会xstatus，这是一个状态掩码，一般我们用的时候就直接用0就可以了
DECLARE @ClearPWD varchar(255)
DECLARE @EncryptedPWD varbinary(255)
SELECT @ClearPWD = 'test'
SELECT @EncryptedPWD = CONVERT(varbinary(255), pwdencrypt(@ClearPWD))
SELECT pwdcompare(@ClearPWD, @EncryptedPWD, 0)
SELECT pwdcompare('ErrorPassword', @EncryptedPWD, 0)
这样我们就可以使用这两个函数来加密自己的密码了，怎么样，还不错吧？
引用自
http://www.bgchina.com/daily/bd_1/
SELECT语法：(基本)
SELECT [DISTINCT]
(column [{, column } ] )| *
FROM table [ { , table} ]
[ORDER BY column [ASC] | [DESC
[{ , column [ASC] | [DESC } ] ]
WHERE predicate [ { logical-connector predicate } ];
------------------------------------------------------
INSERT语法：
INSERT INTO table
[(column { ,column})]
VALUES
(columnvalue [{,columnvalue}]);
------------------------------------------------------
UPDATE语法：
UPDATE table
SET column = value [{, column = value}]
[ WHERE predicate [ { logical-connector predicate}]];
------------------------------------------------------
DELETE语法：
DELETE FROM table
[WHERE predicate [ { logical-connector predicate} ] ];
------------------------------------------------------
常识补充
统计函数：
AVG(字段名) 得出一个表格栏平均值
COUNT(*|字段名) 对数据行数的统计或对某一栏有值的数据行数统计
MAX(字段名) 取得一个表格栏最大的值
MIN(字段名) 取得一个表格栏最小的值
SUM(字段名) 把数据栏的值相加
eg：
sql="select sum(字段名) as 别名 from 数据表 where 条件表达式"
select name from sysobjects where type='U''列出数据库里所有的表名
select name from syscolumns where id=object_id('TableName')'列出表里的所有的
source data
kzx4dm xbdm jylsfsdm ...
11 2 10
11 2 10
12 2 10
12 1 20
12 1 20
destination:
kzx4dm bys_count yjs_count jy_ratio
11 2 2 1.00
12 3 1 1/3
SELECT DISTINCT kzx4dm,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm) AS bys_count,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm WHERE jylsfsdm=10) AS yjs_count,yjs_count/bys_count AS jy_ratio
FROM tablename AS TA
SELECT DISTINCT kzx4dm,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm) AS bys_count,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm AND jylsfsdm=10) AS yjs_count,yjs_count/bys_count AS jy_ratio
FROM tablename AS TA
二维表 T(F1,F2,F3,F4,F5,F6,F7) 表示如下关系:
学生ID 学生姓名 课程ID 课程名称 成绩 教师ID 教师姓名
S3 王五 K4 政治 53 T4 赵老师
S1 张三 K1 数学 61 T1 张老师
S2 李四 K3 英语 88 T3 李老师
S1 张三 K4 政治 77 T4 赵老师
S2 李四 K4 政治 67 T5 周老师
S3 王五 K2 语文 90 T2 王老师
S3 王五 K1 数学 55 T1 张老师
S1 张三 K2 语文 81 T2 王老师
S4 赵六 K2 语文 59 T1 王老师
S1 张三 K3 英语 37 T3 李老师
S2 李四 K1 数学 81 T1 张老师
请以一句 T-SQL (Ms SQL Server) 或 Jet SQL (Ms Access) 在 原表 T 基础上作答
1.如果 T 表还有一字段 F0 数据类型为自动增量整型(唯一,不会重复),
而且 T 表中含有除 F0 字段外,请删除其它字段完全相同的重复多余的脏记录数据:
delete from t where f0 in(select max(f0) from t group by f1,f2,f3,f4,f5,f6,f7 having count(f0)>1)
2.列印各科成绩最高和最低的记录: (就是各门课程的最高、最低分的学生和老师)
课程ID,课程名称,最高分,学生ID,学生姓名,教师ID,教师姓名,最低分,学生ID,学生姓名,教师ID,教师姓名
select tb.f4,tb.f3,tb1.f5,tb.f1,tb.f2,tb.f6,tb.f7,tb2.f5,tb2.f1,tb2.f2,tb2.f6,tb2.f7 from t tb where
f5=(select max(f5) from t where t.f4=tb.f4)
join select f2,f7 from t tb2 where
f5=(select min(f5) from t where t.f4=tb2.f4)
on tb.f4=tb2.f4
先完成一个,想想在做下一个.
3.按成绩从高到低顺序,列印所有学生四门(数学,语文,英语,政治)课程成绩: (就是每个学生的四门课程的成绩单)
学生ID,学生姓名,数学,语文,英语,政治,有效课程数,有效平均分
(注: 有效课程即在 T 表中有该学生的成绩记录,如不明白可不列印"有效课程数"和"有效平均分")
select tb1.f1,tb1.f2,count(tb1.f5) as scores,sum(tb1.f5) as scoresum, avg(tb1.f5) AS average,
tb2.f5,tb3.f5,tb4.f5,tb5.f5
from t as tb1
left join t as tb2
on tb1.f0=tb2.f0 and tb2.f3=k4
left join t as tb3
on tb1.f0=tb3.f0 and tb3.f3=k3
left join t as tb4
on tb1.f0=tb4.f0 and tb4.f3=k2
left join t as tb5
on tb1.f0=tb5.f0 and tb5.f3=k1
grout by tb1.f2 order by tb1.scoresum desc
4.按各科不及格率的百分数从低到高和平均成绩从高到低顺序,统计并列印各科平均成绩和不及格率的百分数(用"N行"表示): (就是分析哪门课程难)
课程ID,课程名称,平均成绩,及格百分数
select f3,f4, (select count(f1) from t where t.f4=tb.f4 and f5<60)/(select count(f1) from t where t.f4=tb.f4) as failper,((select sum(f5) from t where t.f4=tb.f4)/ (select count(f5) from t where t.f4=tb.f4)) as averagescore
from t tb order by failper asc, as averagescore desc
/****** Object: Stored Procedure dbo.dt_checkoutobject Script Date: 2003-3-12 9:25:26 ******/
create proc dbo.dt_checkoutobject
@chObjectType char(4),
@vchObjectName varchar(255),
@vchComment varchar(255),
@vchLoginName varchar(255),
@vchPassword varchar(255),
@iVCSFlags int = 0,
@iActionFlag int = 0/* 0 => Checkout, 1 => GetLatest, 2 => UndoCheckOut */
as
set nocount on
declare @iReturn int
declare @iObjectId int
select @iObjectId =0
declare @VSSGUID varchar(100)
select @VSSGUID = 'SQLVersionControl.VCS_SQL'
declare @iReturnValue int
select @iReturnValue = 0
declare @vchTempText varchar(255)
/* this is for our strings */
declare @iStreamObjectId int
select @iStreamObjectId = 0
declare @iPropertyObjectId int
select @iPropertyObjectId = (select objectid from dbo.dtproperties where property = 'VCSProjectID')
declare @vchProjectName varchar(255)
declare @vchSourceSafeINI varchar(255)
declare @vchServerName varchar(255)
declare @vchDatabaseName varchar(255)
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSProject', @vchProjectName OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSourceSafeINI', @vchSourceSafeINI OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSQLServer', @vchServerName OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSQLDatabase', @vchDatabaseName OUT
if @chObjectType = 'PROC'
begin
/* Procedure Can have up to three streams
Drop Stream, Create Stream, GRANT stream */
exec @iReturn = sp_OACreate @VSSGUID, @iObjectId OUT
if @iReturn <> 0 GOTO E_OAError
exec @iReturn = sp_OAMethod @iObjectId,
'CheckOut_StoredProcedure',
NULL,
@sProjectName = @vchProjectName,
@sSourceSafeINI = @vchSourceSafeINI,
@sObjectName = @vchObjectName,
@sServerName = @vchServerName,
@sDatabaseName = @vchDatabaseName,
@sComment = @vchComment,
@sLoginName = @vchLoginName,
@sPassword = @vchPassword,
@iVCSFlags = @iVCSFlags,
@iActionFlag = @iActionFlag
if @iReturn <> 0 GOTO E_OAError
exec @iReturn = sp_OAGetProperty @iObjectId, 'GetStreamObject', @iStreamObjectId OUT
if @iReturn <> 0 GOTO E_OAError
create table #commenttext (id int identity, sourcecode varchar(255))
select @vchTempText = 'STUB'
while @vchTempText IS NOT NULL
begin
exec @iReturn = sp_OAMethod @iStreamObjectId, 'GetStream', @iReturnValue OUT, @vchTempText OUT
if @iReturn <> 0 GOTO E_OAError
if (@vchTempText IS NOT NULL) insert into #commenttext (sourcecode) select @vchTempText
end
select 'VCS'=sourcecode from #commenttext order by id
select 'SQL'=text from syscomments where id = object_id(@vchObjectName) order by colid
end
CleanUp:
return
E_OAError:
exec dbo.dt_displayoaerror @iObjectId, @iReturn
GOTO CleanUp
GO
1.如果 T 表还有一字段 F0 数据类型为自动增量整型(唯一,不会重复),
而且 T 表中含有除 F0 字段外,请删除其它字段完全相同的重复多余的脏记录数据:
delete from t where f0 in(select max(f0) from t group by f1,f2,f3,f4,f5,f6,f7 having count(f0)>1)
上面这个sql有问题
正确的如下
DELETE Legal_Dispute_Lawyer WHERE Lawyer_Record_No IN(SELECT Lawyer_Record_No FROM Legal_Dispute_Lawyer LDL WHERE Lawyer_Record_No(SELECT TOP 1 Lawyer_Record_No FROM Legal_Dispute_Lawyer WHERE LD=LDL.LD AND Name=LDL.Name AND Email=LDL.Email AND Phone_No=LDL.Phone_No AND Fax_No=LDL.Fax_No))
消除Legal_Dispute_Lawyer 表中除Lawyer_Record_No(自增字段)外其余数据完全相同的记录.
表结构如下
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Legal_Dispute_Lawyer]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Legal_Dispute_Lawyer]
GO
CREATE TABLE [dbo].[Legal_Dispute_Lawyer] (
[Lawyer_Record_No] [int] IDENTITY (1, 1) NOT NULL ,
[LD] [int] NOT NULL ,
[Name] [int] NOT NULL ,
[Phone_No] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
[Fax_No] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
[varchar] (255) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO
以这种方式还可以实现组内消除重复值..
Top
DELETE Legal_Dispute_Lawyer WHERE Lawyer_Record_No IN(SELECT Lawyer_Record_No FROM Legal_Dispute_Lawyer LDL WHERE Lawyer_Record_No<>(SELECT TOP 1 Lawyer_Record_No FROM Legal_Dispute_Lawyer WHERE LD=LDL.LD AND Name=LDL.Name AND Email=LDL.Email AND Phone_No=LDL.Phone_No AND Fax_No=LDL.Fax_No))
table1
kzx4dm xbdm jylsfsdm ...
10 2 8
11 2 9
12 2 19
13 1 18
14 1 19
select top 3 with ties jylsfsdm from table1
结果：
kzx4dm xbdm jylsfsdm ...
12 2 19
14 1 19
13 1 18
11 2 9
说明：取出并列排行的所有记录
Top
回复人： lsqteng(阿琦) ( ) 信誉：102 2003-3-21 14:18:11 得分:0
说到语法我就来兴趣了，哈哈，请看:
SELECT statement::=
<query_experssion>
[ORDER BY {order_by_expression|Column_position[ASC|DESC]}
[,...n]]
[COMPUTE
{{AVG|COUNT|MAX|MIN|SUM}(exression)}[,...n]
[BY expression[,...n]]
]
[FOR {BROWSE |XML{RAW|AUTO|EXPLICIT}
[,XMLDATA]
[,ELEMENTS]
[,BINARY base64]
}
]
[OPTION(<query_hint>[,...n])]
<query expression>::=
{<query specification>|(<query expression>)}
[UNION[ALL]<query specification|(<query expression<)[...n]]
<query specification>::=
SELECT [ALL|DISTINCT]
[{TOP integer|TOP integer PERCENT}[WITH TIES]]
<select _list>
[INTO new_table]
[FROM{<table_source>}[,...n]]
[WHERE <search_condition>]
[GROUP BY [ALL]group_by_expression[,...n]
[WITH{CUBE|ROLLUP}]
]
[HAVING<search_condition>}
哎，行了吧，这还是select 语句的形式。要看完全的，喔，那可不得了喔。我不写了，累死了，呵呵
create table IKnowYou
(userid varchar(30),
TableName varchar(50),
Action varchar(6),
DateT datatime,
TrrigerTableColumns.....,
TrrigerTableColumns.....)
create trriger Who_Do_It on table
for update
as
declare userid varchar(30)
declare TableName varchar(50)
declare Action varchar(6)
userid=@@suser_sname
Action='update'
TableName='tabel'
insert into IKnowYou values(userid,TableName,Action,Now,select * from deleted,select * from inserted)
kill all connections to a given databse
CREATE PROCEDURE usp_killDBConnections @DBName varchar(50), @withmsg bit=1
AS
SET NOCOUNT ON
DECLARE @spidstr varchar(8000)
DECLARE @ConnKilled smallint
SET @ConnKilled=0
SET @spidstr = ''
IF db_id(@DBName) < 4
BEGIN
PRINT 'Connections to system databases cannot be killed'
RETURN
END
SELECT @spidstr=coalesce(@spidstr,',' )+'kill '+convert(varchar, spid)+ '; '
FROM master..sysprocesses WHERE dbid=db_id(@DBName)
IF LEN(@spidstr) > 0
BEGIN
EXEC(@spidstr)
SELECT @ConnKilled = COUNT(1)
FROM master..sysprocesses WHERE dbid=db_id(@DBName)
END
IF @withmsg =1
PRINT CONVERT(VARCHAR(10), @ConnKilled) + ' Connection(s) killed for DB ' + @DBName
GO
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
FROM TABLE1,
(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE, 'YYYY/MM')) X,
(SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM') ¦¦ '/01','YYYY/MM/DD') - 1, 'YYYY/MM') ) Y,
WHERE X.NUM = Y.NUM （+）
AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B
WHERE A.NUM = B.NUM
SELECT * FROM table ORDER BY id
SELECT * FROM table ORDER BY id DESC
正反排序,厉害吧!
select * into b from a where 1<>1
这样生成的b表访问的用户没有select的权限？
请问sql DX们这个问题怎么解决？
Select left(field,1) as field1 from table_name order by field desc
select count(clubmember.clubid)as hot,clubmember.clubid,clubinfo.clubid,clubinfo.name from clubmember,clubinfo where clubinfo.clubid=clubmember.clubid group by clubmember.clubid order by hot DESC limit 10
条件删除
DELETE DBO.TEMP WHERE FLD_CHARACTER IN
(
SELECT FLD_CHARACTER
FROM dbo.TBL_CHARACTER
WHERE (FLD_DELETED = 1) AND (FLD_LEVEL <= 18) AND
(FLD_UPDATEDATETIME <= GETDATE() - 5)
)
选择前数据库里前10条记录：
1、select top 10 * from table
2、set rowcount 10
select * from table
今天才把合计函数搞定：
Set rs=conn.execute("Select min(id) as minID from TABLE") ^_^
select * from 日程安排 where datediff('minute',f开始时间,getdate())>5
日程安排提前五分钟提醒。
select * into b from a where 1<>1
这样生成的b表访问的用户没有select的权限？
请问sql DX们这个问题怎么解决？
指定dbo前缀应该可以解决问题了..
mark!
<%
'取出随机记录
Randomize
RNumber = Int(Rnd*200) + 1
SQL = "SELECT * FROM Customers WHERE ID = " & RNumber
set objRec = ObjConn.Execute(SQL)
Response.WriteRNumber & " = " & objRec("ID") & " " & objRec("c_email")
%>
insert into pbrule(newrid,subj,bz,zf,orid,rstat,layer,bid) select newrid,subj,bz,zf,orid,rstat,layer,bid from pbrule1 where bruleid=bruleid
将pbrule1 表中符合条件的记录 导入 pbrule表中
下面这个更实用，就是两张关联表，删除主表中已经在副表中没有的信息
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
这条语句就是删除 INFO表中infid字段在infobz中不存在的记录
此语句用来维护数据库很有用哦。
楼主给点分吧
CREATE OR REPLACE PROCEDURE DUMP_TO_WEB_TCLHD_SP_OBJ
AS
BEGIN
CALC_PIA_PRICE ;
DELETE FROM TCLHD_SP_OBJ ;
INSERT INTO TCLHD_SP_OBJ (NAME,CODE,ID,PRICE,TYPE,FIELDS) (
SELECT c.DESCRIPTION,C.SEGMENT1,a.INVENTORY_ITEM_ID, nvl(c.ATTRIBUTE14,'0'),0,nvl(c.ATTRIBUTE13,0)
from mtl_item_categories a , mtl_categories b , mtl_system_items c
where a.CATEGORY_ID = b.CATEGORY_ID and b.SEGMENT1='原材料'
and a.INVENTORY_ITEM_ID = c.INVENTORY_ITEM_ID AND A.ORGANIZATION_ID = 21
and c.ORGANIZATION_ID = 21 and c.inventory_item_status_code = 'Active' );
COMMIT ;
END ;
数据库IBM DB2 》》》SQL
绝对精华
select dmbh,SJDM,flsm,dmzz from ydm where dmbh=3300
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh=3300)
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300)))
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))))
**********************************
select SJDM from ydm where dmbh=3300
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh=3300)
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300)))
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))))
**************************************************
SELECT COUNT(*) as yhs ,SUM(DF) as df FROM DB2.DFTDF
WHERE (year(rq)*12+month(rq)) between 24015 and 24015
AND dflb=513
and (ZHH,YYH) IN
(SELECT ZHH,YYxH FROM DB2.YDD111 WHERE HYM in
( select SJDM from DB2.ydm where dmbh=3200
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200)
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200))
union all
select SJDM from DB2.ydm where dmbh in (
Select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200)))
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200))))
))
***********************************************
select bcm,bsm,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm
from jldb) as jldb2
group by bcm,bsm
select bcm,bsm,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm
from jldb
where bzt='OK' and qyrq between '1999-1-1' and '2003-1-3' ) as jldb2
group by bcm,bsm
****************
select bcm,bsm,bxh,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm,bxh
from jldb
where bzt='OK' and qyrq between '1999-1-1' and '2003-1-3' ) as jldb2
group by bcm,bxh,bsm
**********************************************
with ttt as (select bcm,bxh,bsm,count(bsm) as sl from (select bcm,bxh,case when blx ='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%' then '机械表 ' else 'DZB' end
as bsm from jldb where bzt='OK' and qyrq<='2002-2-2' ) as jldb2 group by bcm,bxh,bsm),
sss as (select bcm,bxh,bsm,count(bsm) as sl1 from (select bcm,bxh,case when blx ='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%' then '机械表 ' else 'DZB' end
as bsm from jldb where bzt='OK' and qyrq<='2000-1-1' ) as jldb2 group by bcm,bxh,bsm)
select ttt.bcm,ttt.bxh,ttt.bsm,value(ttt.sl,0) as sl1,value(sss.sl1,0) as sl2,(value(ttt.sl,0)-value(sss.sl1,0)) as sl3 from ttt full join sss
on sss.bxh=ttt.bxh and sss.bcm=ttt.bcm and sss.bsm=ttt.bsm order by ttt.bcm,ttt.bxh,ttt.bsm
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
选择在每一组b值相同的数据中对应的a最大的(换成average或别的函数或子查询,你会有意想不到的发现)记录的所有信息.
类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.
上面的许多同志对子查询存在有偏见与误解,其实在一个好的数据分析程序中,子查询可以简化很多程序逻辑.
<%
'取出随机记录
Randomize
RNumber = Int(Rnd*200) + 1
SQL = "SELECT * FROM Customers WHERE ID = " & RNumber
set objRec = ObjConn.Execute(SQL)
Response.WriteRNumber & " = " & objRec("ID") & " " & objRec("c_email")
%>
这种方法存在bug,有可能取不出数据来，
最好还是还
select top 1 * from tablename order by newid()
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
这可是一个经典的SQL.
大概再加几层嵌套,查询引擎都可以崩溃了..
下面的语句不是精华.但是却是用很多用T-SQL进行开发的同志所不了解的..
如何更新nText,Text,Image字段数据..
DECLARE @ptrval binary(16)
SELECT @ptrval = TEXTPTR(LSD_Comment)
FROM Legal_Dispute WHERE LD_Record_No=25 --得到指定记录的nText文本指针
UPDATETEXT Legal_Dispute.LSD_Comment @ptrval 0 0 N'Insert Text Content Into Old Content Before' ---将数据插入在老数据之前.
很多同志在更新nText字段的时候使用一个记录集取回ASP然后一次性用"UPDATE set fieldname='" & new content & old content & "'"的方式实现..
却不知道,sql string一次只能提交的string是有限制的,这样一来,实际的text,ntext永远也不可能存储它所支持的最大长度的数据..也远远不能达到使用nText字段的目的了..
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回复人： jtmoon(逍遥小贼) ( ) 信誉：234 2003-3-26 12:50:27 得分:0
呵呵，不错啊，收藏
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回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-3-26 17:49:24 得分:0
有好料快点贴，不久要揭贴喽!
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回复人： chinahuman(枯) ( ) 信誉：105 2003-3-26 19:36:33 得分:0
高手们来看一看这个问题了http://expert.csdn.net/Expert/topic...xml?temp=5.489528E-03
在线等了！
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-26 21:12:14 得分:0
to 上面的兄弟
SELECT * INTO [D:\database.mdb].table4 FROM [C:\database.mdb].table1
前提是ASP用户对后者有读权限.
前者有写权限
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回复人： guiguai(鬼怪) ( ) 信誉：101 2003-3-26 22:09:06 得分:0
收藏！
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回复人： wertou() ( ) 信誉：100 2003-3-27 10:55:30 得分:0
select * from studentinfo where not exists (select * from student where studentinfo.id=student.id) and 系名称='"& strdepartmentname&"' and 专业名称='"&strprofessionname& "' order by 性别,生源地,高考总成绩
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回复人： Swanzy(志远) ( ) 信誉：100 2003-3-27 11:57:47 得分:0
请问查询时时有两行相同的记录，如何去掉一行？（其中包含TEXT数据类型）
select brepeople, 姓名,bbs_content.* from bbs_revert,bbs_content,bbs_userinfo where bauthor= 职员id and brepeople='m043' and bbs_content.id=bid
显示“我”参加的主题回复时，如果本主题回复了两次以上，那查询的结果将有两行以上的记录。
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回复人： huangang(H.G) ( ) 信誉：100 2003-3-27 12:08:42 得分:0
select * form a like %keywords%
模糊查询
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-27 12:20:43 得分:0
to Swanzy(志远)
包含有text类型数据是无法进行消除重复值处理的..
因为在sql server中text处理为一个指针..
读取并比较该字段需要专用的语法
如果要做,建议在存储过程中做或将该字段排除在比较条件外
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回复人： 98130(Oracle) ( ) 信誉：100 2003-3-27 12:41:06 得分:0
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
我怎么运行不了?
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-27 14:18:27 得分:0
to 98130(Oracle)
下面的可以.但是好象看起来很没有必要
select top 1 num1 from
(select top 5 num1 from
(select top 1 num1 from
(select top 5 num1
from table1
order by num1 desc) as a
order by num1 asc) as b
order by num1 asc) as c
order by num1 desc
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回复人： tigerflyfly(小飞虎) ( ) 信誉：100 2003-3-27 21:20:40 得分:0
取出最先的是select top * from tablename
取出最后的几条是什么？
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回复人： clipper_clipper(clipper_clipper) ( ) 信誉：104 2003-3-27 21:46:59 得分:0
select count(*) from tb_tablename
经常用的，取记录数
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回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-3-28 9:26:47 得分:0
t tigerflyfly(小飞虎)
还是用select top,只是排序倒过来即可，比如：
select top 10 * from tablename order by id desc
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回复人： entice(踏雪寻梅) ( ) 信誉：106 2003-3-28 9:27:16 得分:0
to tigerflyfly(小飞虎)
用排序呀。
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回复人： xiaojiyi(小己乙) ( ) 信誉：100 2003-3-28 11:15:44 得分:0
分页语句
select top 100 * from 表名 where id not in (select top page_no*100 * from 表名)
page_no是程序中的变量
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回复人： xiaoshi(js真痛苦!我要被炒了) ( ) 信誉：101 2003-3-28 11:42:47 得分:0
我收藏
中午来看
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:16:31 得分:0
从数据库直接输出XML数据:
select text1,text2 from table1 where text1 like '%alu_ok%' for xml auto
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:19:12 得分:0
UPDATE titles
SET t.ytd_sales = t.ytd_sales + s.qty
FROM titles t, sales s
WHERE t.title_id = s.title_id
AND s.ord_date = (SELECT MAX(sales.ord_date) FROM sales)
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回复人： PeterMCT(天天下雨1991) ( ) 信誉：101 2003-3-28 13:21:02 得分:0
up
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:21:07 得分:0
DELETE authors
FROM (SELECT TOP 10 * FROM authors) AS t1
WHERE authors.au_id = t1.au_id
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:22:26 得分:0
初始化表table1
TRUNCATE TABLE table1
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回复人： lxxlily(笨鸟先飞) ( ) 信誉：107 2003-3-28 13:31:43 得分:0
cnuninet(www.helloaspx.com) :晕～～
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:11:57 得分:0
从入库信息表和入库清单表中得期初期末库存：
SELECT a.mattype as mattype, a.matname as matname, a.spec as spec,a.indate as indate, a.amount AS lastnum, a.matsum AS lastsum,
b.amount AS curnum, b.matsum AS cursum
FROM (SELECT a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm') AS indate,
SUM(b.amount) AS amount, SUM(b.matsum) AS matsum
FROM (SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) a,
(SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) b
WHERE TO_CHAR(b.indate, 'yyyy-mm') <= TO_CHAR(a.indate, 'yyyy-mm') AND
a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+)
GROUP BY a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm')) a,
---未完，待续
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:13:01 得分:0
---接上面
(SELECT a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm') AS indate,
SUM(b.amount) AS amount, SUM(b.matsum) AS matsum
FROM (SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) a,
(SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount,
SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0) + NVL(c.matsum, 0))
AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) b
WHERE TO_CHAR(b.indate, 'yyyy-mm') <= TO_CHAR(a.indate, 'yyyy-mm') AND
a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+)
GROUP BY a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm'))
b
WHERE a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+) AND TO_DATE(a.indate, 'yyyy-mm')
= ADD_MONTHS(TO_DATE(b.indate, 'yyyy-mm'), 1)
--语句完毕
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:15:27 得分:0
上面用的是Oracle数据库。由于涉及到双向外连接，所以很长
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回复人： zhongjz(小海螺) ( ) 信誉：105 2003-3-28 15:46:39 得分:5
从数据库中去一年的各单位电话费统计（电话费定额贺电化肥清单两个表来源）
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
FROM TELFEESTAND a, TELFEE b
WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy')
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回复人： zzlcn() ( ) 信誉：86 2003-3-28 17:24:15 得分:0
请问如果有 10 万 条数据 该怎么查询，我一查询就出错
如果是3万条还可以接受，但是到了3万条以上就不稳定！
我用了 sqlserver 也没有用
10 万条数据来一次分页显示居然要 10-15秒的超长时间！！！！！
如果在分页显示中查询，立即告吹！！！
asp 和 asp.net 我都试用过（＋ ms sqlserver）
均是如此
是不是 asp 和 asp.net 都是垃圾中的垃圾！！！
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-28 17:40:16 得分:0
大量复杂的数据分析,在结构设计上就应该要考虑进去.适当设置一些字段或表存储分段统计信息.
否则再好的数据库都撑不住的..
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回复人： sishuo(思铄) ( ) 信誉：100 2003-3-29 9:39:01 得分:0
好，收了。
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回复人： huijunzi(Cyril) ( ) 信誉：97 2003-3-30 16:49:18 得分:5
有意思,我也来一个，解决跳号的问题：
select min(bh)+1 from Table1 where bh+1 not in(select bh from Table1)
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-31 9:50:13 得分:0
进行复杂数据分析还有一种趋势那就是使用数据仓库(Data Houseware)和OLAP.
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回复人： bkss(白开水水) ( ) 信誉：100 2003-4-1 11:09:20 得分:0
哈哈，我也来凑热闹。。。
DECLARE @QuitMedNo char(13)
DECLARE @PreRecipeNo char(13),@PreRecipeXNo char(3)
Declare @zyxh char(12),@kdks char(8)
DECLARE @DepotName char(10)
BEGIN TRAN
if not exists(select 摆药单号 from 摆药单 where 状态='00' and 摆药单号=@PutMedNo)
begin
return 0
end
EXECUTE Sp_GetBillNo @QuitMedNo output,'D'
INSERT INTO [退药]([退药序号], [操作员], [退药时间], [退药说明])
VALUES(@QuitMedNo,@Operator,cast(getdate() as smalldatetime),@Intro)
if (@@error<>0 or @@rowcount=0)
begin
rollback transaction
raiserror('插入退药表失败',16,-1)
return 1
end
DECLARE PutMed_Cursor CURSOR FOR
SELECT DISTINCT A.处方号,A.处方序号,B.住院序号,B.科室,C.名称 as 摆药区 FROM 摆药单明细 A inner join 处方 B ON A.处方号 =B.处方号 AND A.处方序号=B.处方序号
INNER JOIN 摆药区 C ON B.摆药区=C.代码 WHERE A.摆药单号=@PutMedNo
OPEN PutMed_Cursor
FETCH NEXT FROM PutMed_Cursor INTO @PreRecipeNo, @PreRecipeXNo,@zyxh,@kdks,@DepotName
WHILE @@FETCH_STATUS = 0
BEGIN
EXEC usp_QuitBillDetail @QuitMedNo ,@PutMedNo,@PreRecipeNo,@PreRecipeXNo,@zyxh,@kdks,@fsks,@DepotName
--另一个存储过程
if (@@error<>0)
begin
rollback transaction
CLOSE PutMed_Cursor
--DEALLOCATE PutMed_Cursor
raiserror('更新退单处方明细失败',16,-1)
return 1
end
FETCH NEXT FROM PutMed_Cursor INTO @PreRecipeNo, @PreRecipeXNo,@zyxh,@kdks
END
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回复人： bkss(白开水水) ( ) 信誉：100 2003-4-1 11:21:36 得分:10
个人认为，偶写了这么久的SQL，只说语法很无聊，语句的涵义与灵活的组合很重要，下面这个是写的一个药品管理的存储过程的一句，很经典：
UPDATE 药房库存 SET 库存数量=库存数量-B.用量 FROM [药房库存] A ,
( Select sum(用量) as 用量,药品价码 FROM 处方项
WHERE 处方号=@RecipeNo AND 处方序号=@RecipeXNo
GROUP BY 药品价码
) B WHERE A.药品价码=B.药品价码 AND A.库房名称=@DepotName
这是一个参照B表将A表中库存一一修改，而B表中存在一个求和，A表也与B表关联，同时要满足A表条件。
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-1 11:26:50 得分:0
是的..SQL中应用的经典应该只考虑SQL查询的应用..
存储过程已经使用控制语法操作了,和别的程序设计语言设计算法没什么区别..
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回复人： yexiao(叶开) ( ) 信誉：100 2003-4-1 14:11:35 得分:0
gz
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回复人： rong451(rong451) ( ) 信誉：100 2003-4-1 15:43:10 得分:0
very good 我一定收藏！！！
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回复人： gengwei80(gengwei) ( ) 信誉：99 2003-4-2 9:40:27 得分:0
create or replace procedure p_table
(
p_g3e_fno g3e_features_optable.g3e_fno%type
)
as
v_xlmc VARCHAR2(12);
v_XLDM VARCHAR2(5);
cursor c_table IS
select g3e_table from g3e_component where g3e_cno=(select g3e_primaryattributecno
from g3e_features_optable where g3e_fno=p_g3e_fno);
type t_sor is ref cursor;
v_sor t_sor;
str varchar2(50);
begin
for v_table in c_table loop
str:='select xlmc,xldm from '||v_table.g3e_table;
dbms_output.put_line(v_table.g3e_table);
open v_sor for str;
loop
fetch v_sor into v_xlmc,v_xldm;
dbms_output.put_line('hello g3e_table');
dbms_output.put_line(v_xlmc||' '||v_xldm);
exit when v_sor%notfound;
end loop;
close v_sor;
end loop;
end p_table;
个人主页 | 引用 | 返回
回复:[分享]SQl语句学习专题
晴天发表评论于2004-10-26 11:18:00
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回复人： bloodsha(huangxi) ( ) 信誉：98 2003-4-3 8:58:06 得分:0
学
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回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-4-3 11:40:16 得分:0
回复人： csdntoll(toll) ( ) 信誉：100 2003-3-21 10:02:00 得分:0
我决定：把200分中的180分，奖给贴出最精妙的SQL的高手！
-------------------------------------------------------------------
想揭贴，可是为难了：
我要遵守自己说过的话（如上），可我菜，鉴别能力有限，怎么办？
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回复人： wilsonGao(笑傲江湖) ( ) 信誉：101 2003-4-3 13:29:11 得分:0
如何用一句语句实现两个表的关键字倒换？
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回复人： pyz8000(黑洞) ( ) 信誉：101 2003-4-3 18:48:04 得分:0
晕倒，，，收藏～～
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回复人： chinahuman(枯) ( ) 信誉：105 2003-4-3 18:50:07 得分:0
有没有办法一条语句实现以下功能：比如一个新闻系统里有很多个管理员，在添加过程中每条都记录管理员的ID，现想根据用户ID来实现统计它们添加的条数？
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-3 19:29:42 得分:0
to chinahuman(枯)
一个group by和一个聚合函数(count)就可以了..
select count(Title) from news group by creade_by
如果需要得到除非聚合字段外的详细信息那么就得使用相关子查询了..
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回复人： ld_key(什么名字也想) ( ) 信誉：100 2003-4-4 9:59:55 得分:0
markable
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回复人： superdullwolf(超级大笨狼) ( ) 信誉：99 2003-4-4 22:04:45 得分:0
看我的，四表联查问题：
select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
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回复人： superdullwolf(超级大笨狼) ( ) 信誉：99 2003-4-4 22:11:39 得分:10
应聘做了一个小程序,在多人中表现最好,高兴,散分100!!是关于sql查询显示的
题目大概是SQL 表1：班级/老师 表2学生/班级 表三数学/学生 表4语文/学生
查询显示结果大概是这样：
班级1 老师1
学生1 数学 语文
学生2 数学 语文
班级2 老师1
学生1 数学 语文
学生2 数学 语文
不及格：
学生1 班级1 老师1 数学 语文
学生1 班级1 老师1 数学 语文
还有录入学生和成绩的界面
用到了多表之间的inner join on 语句，而且我显示的很漂亮，靠，做了一下午，我好想抽烟啊，当时：）
看我的，四表联查问题：
select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-7 9:43:55 得分:0
左连接右连接内连接全部上马,的确经典哦.
据说你写过上万行代码,大概这就是最经典的一段代码了吧.
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回复人： zady(森林木) ( ) 信誉：100 2003-4-7 14:56:01 得分:5
需求：
得到表中最小的未使用的ID号。
例：
table Name:Handle
HandleID
--------
1
2
5
6
7
--5 Records
执行结果须为3
解决：
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)
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回复人： Iamfish(呆鱼) ( ) 信誉：105 2003-4-8 13:36:00 得分:80
两台SQL服务器上的一个数据表同步!
drop procedure dbSync
GO
/* 数据同步 */
CREATE PROCEDURE dbSync
@sTabelName varchar(255), --要同步的表名
@sKeyField varchar(255), --关键字段
@sServer varchar(255), --服务器名称或IP
@sUserName varchar(255), --登录到服务器的用户名，一般为sa
@sPassWord varchar(32) --用户登录到服务器的密码
AS
/*删除临时表*/
if exists (select * from dbo.sysobjects where id = object_id(N'tempTbl') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table tempTbl
declare @sql VARCHAR(2000)
/*把表@sTabelName[远程]的数据拷贝到临时表*/
set @sql='select * into tempTbl from '
set @sql=@sql + ' OPENDATASOURCE( '
set @sql=@sql + '''SQLOLEDB.1'','
set @sql=@sql + '''Persist Security Info=True;User ID=' + @sUserName
set @sql=@sql + ';Password=' + @sPassWord
set @sql=@sql + ';Initial Catalog=toys;Data Source=' + @sServer
set @sql=@sql + ''').toys.dbo.'+@sTabelName
EXEC(@sql)
/* 把@sTabelName[本地]中的@sTabelName[远程]表中没有的数据插入到临时表中*/
set @sql='insert into tempTbl select * from '+@sTabelName+' where ['+@sKeyField+'] not in (select ['+@sKeyField+'] from tempTbl)'
EXEC(@sql)
/*清空表@sTabelName[本地]*/
set @sql='truncate table '+@sTabelName
EXEC(@sql)
--取得列名
declare @MySql VARCHAR(2000)
set @MySql=''
declare @title varchar(20)
DECLARE titles_cursor CURSOR FOR
SELECT name from syscolumns where id=object_id(@sTabelName)
OPEN titles_cursor
FETCH NEXT FROM titles_cursor INTO @title
WHILE @@FETCH_STATUS = 0
BEGIN
if @title<>'id'
begin
if @MySql = ''
set @MySql = @MySql + @title
else
set @MySql = @MySql + ',' + @title
end
FETCH NEXT FROM titles_cursor INTO @title
END
CLOSE titles_cursor
DEALLOCATE titles_cursor
--取列名结束
/*把临时表的内容插入到表@sTabelName[本地]*/
set @sql='insert into '+@sTabelName+' select '+@MySql+' from tempTbl'
EXEC(@sql)
/*删除临时表*/
if exists (select * from dbo.sysobjects where id = object_id(N'tempTbl') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table tempTbl
GO
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回复人： lizongqi(英雄啊) ( ) 信誉：100 2003-4-8 15:02:07 得分:0
收藏ing..
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回复人： Swanzy(志远) ( ) 信誉：100 2003-4-8 18:06:08 得分:0
收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏
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回复人： zhyx21century(zhyx) ( ) 信誉：100 2003-4-9 11:19:17 得分:0
UP
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回复人： kingkout(kingkout) ( ) 信誉：100 2003-4-9 14:05:22 得分:0
GZ
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回复人： xxl0914(microlin) ( ) 信誉：105 2003-4-9 14:23:49 得分:0
用sql语句对不同的几张表做笛卡尔积
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回复人： lizongqi(英雄啊) ( ) 信誉：100 2003-4-10 10:44:56 得分:0
收藏ing....
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回复人： xieyj(快乐天使) ( ) 信誉：103 2003-4-11 8:36:16 得分:5
查找一个已知字段所在的表名：
Select Name From Sysobjects Where Id in (select id from syscolumns where name='字段名')
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回复人： leeeel(三角比三星差？) ( ) 信誉：100 2003-4-11 8:55:15 得分:0
强列地反对多个 Select 套在一个语句中使用 ！
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回复人： zhaoming1112(随风往事) ( ) 信誉：100 2003-4-11 11:44:58 得分:0
SELECT套在一起，好用，我不反对。
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回复人： csdnshao(如水人生) ( ) 信誉：105 2003-4-11 11:50:17 得分:0
mark
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回复人： cuoban(搓板) ( ) 信誉：100 2003-4-11 14:57:58 得分:5
前些日子刚写的
说明：进行判断，得出两种应纳税额。
SELECT 姓名, BM AS 部门, SF1 AS 实发, SFZH AS 身份证, Jjje AS 奖金, SF1 + Jjje - 860 AS 应纳所得, XL AS 学历, NTG AS 性别, GWW AS 职务, round((CASE WHEN (SF1 + Jjje - 860 < 500) THEN (SF1 + Jjje - 860) * 0.05 ELSE CASE WHEN (SF1 + Jjje - 860 > 500) THEN (SF1 + GJJ - 860) * 0.10 - 25 END END), 2) AS 应纳税额 FROM GZ20029 WHERE (sf1 + Jjje) > 860
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回复人： lanyd(山雨欲来风满楼) ( ) 信誉：100 2003-4-11 16:13:44 得分:0
强！
看完这些，我也成sql专家了，哈哈
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回复人： 750906(750906) ( ) 信誉：105 2003-4-11 16:29:33 得分:0
SELECT A.*, B.ColumnString AS ColumnString,
(SELECT COUNT(StatuteId)
FROM StatuteLib_Body
WHERE ColumnId IN
(SELECT ColumnId
FROM StatuteLib_ColumnString
WHERE ColumnString LIKE B.ColumnString + '%')) AS StatuteCount
FROM cw25109.StatuteLib_Column A INNER JOIN
cw25109.StatuteLib_ColumnString B ON A.ColumnId = B.ColumnId
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回复人： Swanzy(志远) ( ) 信誉：100 2003-4-12 11:04:11 得分:0
如何查询表中为空值的所有字段内容？
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回复人： xdk(冼德锟) ( ) 信誉：97 2003-4-12 11:37:01 得分:0
好...我是来抢分加收藏的...
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回复人： yu_shi_bin(清风) ( ) 信誉：100 2003-4-14 13:13:18 得分:0
mark
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回复人： sohi(阿梓) ( ) 信誉：100 2003-4-15 8:20:17 得分:0
good
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回复人： laker_tmj(laker) ( ) 信誉：100 2003-4-15 12:22:45 得分:0
up
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回复人： cboy2003(三碗（cpubook.com)) ( ) 信誉：100 2003-4-15 12:26:13 得分:0
不错
全部收了，我把常用的，最最普通的贴出来大家看看吧，我是对上面的某些半知，对自己贴的
还能用用，哈哈
SQL常用命令使用方法：
(1) 数据记录筛选：
sql="select * from 数据表 where 字段名=字段值 order by 字段名 [desc]"
sql="select * from 数据表 where 字段名 like '%字段值%' order by 字段名 [desc]"
sql="select top 10 * from 数据表 where 字段名 order by 字段名 [desc]"
sql="select * from 数据表 where 字段名 in ('值1','值2','值3')"
sql="select * from 数据表 where 字段名 between 值1 and 值2"
(2) 更新数据记录：
sql="update 数据表 set 字段名=字段值 where 条件表达式"
sql="update 数据表 set 字段1=值1,字段2=值2 …… 字段n=值n where 条件表达式"
(3) 删除数据记录：
sql="delete from 数据表 where 条件表达式"
sql="delete from 数据表" (将数据表所有记录删除)
(4) 添加数据记录：
sql="insert into 数据表 (字段1,字段2,字段3 …) valuess (值1,值2,值3 …)"
sql="insert into 目标数据表 select * from 源数据表" (把源数据表的记录添加到目标数据表)
(5) 数据记录统计函数：
AVG(字段名) 得出一个表格栏平均值
COUNT(*|字段名) 对数据行数的统计或对某一栏有值的数据行数统计
MAX(字段名) 取得一个表格栏最大的值
MIN(字段名) 取得一个表格栏最小的值
SUM(字段名) 把数据栏的值相加
引用以上函数的方法：
sql="select sum(字段名) as 别名 from 数据表 where 条件表达式"
set rs=conn.excute(sql)
用 rs("别名") 获取统的计值，其它函数运用同上。
(5) 数据表的建立和删除：
CREATE TABLE 数据表名称(字段1 类型1(长度),字段2 类型2(长度) …… )
例：CREATE TABLE tab01(name varchar(50),datetime default now())
DROP TABLE 数据表名称 (永久性删除一个数据表)
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回复人： zigzag81814() ( ) 信誉：100 2003-4-15 13:09:38 得分:0
好
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回复人： skyswan(施望) ( ) 信誉：100 2003-4-15 13:33:36 得分:0
怎么都是用在Sql Server上的。
有好多是不能用在Oracle的PL/SQL上的
SQL语法参考手册
2001年3月22日
DB2 提供了关连式资料库的查询语言 ＳＱＬ (Structured Query Language)，是一种非常口语化、既易学又易懂的语法。此一语言几乎是每个资料库系统都必须提供的，用以表示关连式的操作，包含了资料的定义（ＤＤＬ）以及资料的处理（ＤＭＬ）。SQL原来拼成SEQUEL，这语言的原型以"系统 R"的名字在 IBM 圣荷西实验室完成，经过IBM内部及其他的许多使用性及效率测试，其结果相当令人满意，并决定在系统R 的技术基础发展出来 IBM 的产品。而且美国国家标准学会（ANSI）及国际标准化组织（ISO）在1987遵循一个几乎是以 IBM SQL 为基础的标准关连式资料语言定义。
一、资料定义 ＤＤＬ（Data Definition Language)
资料定语言是指对资料的格式和形态下定义的语言，他是每个资料库要建立时候时首先要面对的，举凡资料分哪些表格关系、表格内的有什麽栏位主键、表格和表格之间互相参考的关系等等，都是在开始的时候所必须规划好的。
１、建表格：
CREATE TABLE table_name(
column1 DATATYPE [NOT NULL] [NOT NULL PRIMARY KEY],
column2 DATATYPE [NOT NULL],
...）
说明：
DATATYPE --是资料的格式，详见表。
NUT NULL --可不可以允许资料有空的（尚未有资料填入）。
PRIMARY KEY --是本表的主键。
２、更改表格
ALTER TABLE table_name
ADD COLUMN column_name DATATYPE
说明：增加一个栏位（没有删除某个栏位的语法。
ALTER TABLE table_name
ADD PRIMARY KEY (column_name)
说明：更改表得的定义把某个栏位设为主键。
ALTER TABLE table_name
DROP PRIMARY KEY (column_name)
说明：把主键的定义删除。
３、建立索引
CREATE INDEX index_name ON table_name (column_name)
说明：对某个表格的栏位建立索引以增加查询时的速度。
４、删除
DROP table_name
DROP index_name
二、的资料形态 DATATYPEs
smallint
16 位元的整数。
interger
32 位元的整数。
decimal(p,s)
p 精确值和 s 大小的十进位整数，精确值p是指全部有几个数(digits)大小值，s是指小数
点後有几位数。如果没有特别指定，则系统会设为 p=5; s=0 。
float
32位元的实数。
double
64位元的实数。
char(n)
n 长度的字串，n不能超过 254。
varchar(n)
长度不固定且其最大长度为 n 的字串，n不能超过 4000。
graphic(n)
和 char(n) 一样，不过其单位是两个字元 double-bytes， n不能超过127。这个形态是为
了支援两个字元长度的字体，例如中文字。
vargraphic(n)
可变长度且其最大长度为 n 的双字元字串，n不能超过 2000。
date
包含了 年份、月份、日期。
time
包含了 小时、分钟、秒。
timestamp
包含了 年、月、日、时、分、秒、千分之一秒。
三、资料操作 ＤＭＬ （Data Manipulation Language)
资料定义好之後接下来的就是资料的操作。资料的操作不外乎增加资料（insert)、查询资料（query）、更改资料（update) 、删除资料（delete）四种模式，以下分 别介绍他们的语法：
１、增加资料：
INSERT INTO table_name (column1,column2,...)
VALUES ( value1,value2, ...)
说明：
1.若没有指定column 系统则会按表格内的栏位顺序填入资料。
2.栏位的资料形态和所填入的资料必须吻合。
3.table_name 也可以是景观 view_name。
INSERT INTO table_name (column1,column2,...)
SELECT columnx,columny,... FROM another_table
说明：也可以经过一个子查询（subquery）把别的表格的资料填入。
２、查询资料：
基本查询
SELECT column1,columns2,...
FROM table_name
说明：把table_name 的特定栏位资料全部列出来
SELECT *
FROM table_name
WHERE column1 = xxx
[AND column2 > yyy] [OR column3 <> zzz]
说明：
1.'*'表示全部的栏位都列出来。
2.WHERE 之後是接条件式，把符合条件的资料列出来。
SELECT column1,column2
FROM table_name
ORDER BY column2 [DESC]
说明：ORDER BY 是指定以某个栏位做排序，[DESC]是指从大到小排列，若没有指明，则是从小到大
排列
组合查询
组合查询是指所查询得资料来源并不只有单一的表格，而是联合一个以上的
表格才能够得到结果的。
SELECT *
FROM table1,table2
WHERE table1.colum1=table2.column1
说明：
1.查询两个表格中其中 column1 值相同的资料。
2.当然两个表格相互比较的栏位，其资料形态必须相同。
3.一个复杂的查询其动用到的表格可能会很多个。
整合性的查询：
SELECT COUNT (*)
FROM table_name
WHERE column_name = xxx
说明：
查询符合条件的资料共有几笔。
SELECT SUM(column1)
FROM table_name
说明：
1.计算出总和，所选的栏位必须是可数的数字形态。
2.除此以外还有 AVG() 是计算平均、MAX()、MIN()计算最大最小值的整合性查询。
SELECT column1,AVG(column2)
FROM table_name
GROUP BY column1
HAVING AVG(column2) > xxx
说明：
1.GROUP BY: 以column1 为一组计算 column2 的平均值必须和 AVG、SUM等整合性查询的关键字
一起使用。
2.HAVING : 必须和 GROUP BY 一起使用作为整合性的限制。
复合性的查询
SELECT *
FROM table_name1
WHERE EXISTS (
SELECT *
FROM table_name2
WHERE conditions )
说明：
1.WHERE 的 conditions 可以是另外一个的 query。
2.EXISTS 在此是指存在与否。
SELECT *
FROM table_name1
WHERE column1 IN (
SELECT column1
FROM table_name2
WHERE conditions )
说明：
1. IN 後面接的是一个集合，表示column1 存在集合里面。
2. SELECT 出来的资料形态必须符合 column1。
其他查询
SELECT *
FROM table_name1
WHERE column1 LIKE 'x%'
说明：LIKE 必须和後面的'x%' 相呼应表示以 x为开头的字串。
SELECT *
FROM table_name1
WHERE column1 IN ('xxx','yyy',..)
说明：IN 後面接的是一个集合，表示column1 存在集合里面。
SELECT *
FROM table_name1
WHERE column1 BETWEEN xx AND yy
说明：BETWEEN 表示 column1 的值介於 xx 和 yy 之间。
３、更改资料：
UPDATE table_name
SET column1='xxx'
WHERE conditoins
说明：
1.更改某个栏位设定其值为'xxx'。
2.conditions 是所要符合的条件、若没有 WHERE 则整个 table 的那个栏位都会全部被更改。
４、删除资料：
DELETE FROM table_name
WHERE conditions
说明：删除符合条件的资料。
说明：关于WHERE条件后面如果包含有日期的比较，不同数据库有不同的表达式。具体如下：
(1)如果是ACCESS数据库，则为：WHERE mydate>#2000-01-01#
(2)如果是ORACLE数据库，则为：WHERE mydate>cast('2000-01-01' as date)
或：WHERE mydate>to_date('2000-01-01','yyyy-mm-dd')
在Delphi中写成：
thedate='2000-01-01';
query1.SQL.add('select * from abc where mydate>cast('+''''+thedate+''''+' as date)');
如果比较日期时间型，则为：
WHERE mydatetime>to_date('2000-01-01 10:00:01','yyyy-mm-dd hh24:mi:ss')
SQL语句集锦
--语 句 功 能
--数据操作
SELECT --从数据库表中检索数据行和列
INSERT --向数据库表添加新数据行
DELETE --从数据库表中删除数据行
UPDATE --更新数据库表中的数据
--数据定义
CREATE TABLE --创建一个数据库表
DROP TABLE --从数据库中删除表
ALTER TABLE --修改数据库表结构
CREATE VIEW --创建一个视图
DROP VIEW --从数据库中删除视图
CREATE INDEX --为数据库表创建一个索引
DROP INDEX --从数据库中删除索引
CREATE PROCEDURE --创建一个存储过程
DROP PROCEDURE --从数据库中删除存储过程
CREATE TRIGGER --创建一个触发器
DROP TRIGGER --从数据库中删除触发器
CREATE SCHEMA --向数据库添加一个新模式
DROP SCHEMA --从数据库中删除一个模式
CREATE DOMAIN --创建一个数据值域
ALTER DOMAIN --改变域定义
DROP DOMAIN --从数据库中删除一个域
--数据控制
GRANT --授予用户访问权限
DENY --拒绝用户访问
REVOKE --解除用户访问权限
--事务控制
COMMIT --结束当前事务
ROLLBACK --中止当前事务
SET TRANSACTION --定义当前事务数据访问特征
--程序化SQL
DECLARE --为查询设定游标
EXPLAN --为查询描述数据访问计划
OPEN --检索查询结果打开一个游标
FETCH --检索一行查询结果
CLOSE --关闭游标
PREPARE --为动态执行准备SQL 语句
EXECUTE --动态地执行SQL 语句
DESCRIBE --描述准备好的查询
---局部变量
declare @id char(10)
--set @id = '10010001'
select @id = '10010001'
---全局变量
---必须以@@开头
--IF ELSE
declare @x int @y int @z int
select @x = 1 @y = 2 @z=3
if @x > @y
print 'x > y' --打印字符串'x > y'
else if @y > @z
print 'y > z'
else print 'z > y'
--CASE
use pangu
update employee
set e_wage =
case
when job_level = ’1’ then e_wage*1.08
when job_level = ’2’ then e_wage*1.07
when job_level = ’3’ then e_wage*1.06
else e_wage*1.05
end
--WHILE CONTINUE BREAK
declare @x int @y int @c int
select @x = 1 @y=1
while @x < 3
begin
print @x --打印变量x 的值
while @y < 3
begin
select @c = 100*@x + @y
print @c --打印变量c 的值
select @y = @y + 1
end
select @x = @x + 1
select @y = 1
end
--WAITFOR
--例 等待1 小时2 分零3 秒后才执行SELECT 语句
waitfor delay ’01:02:03’
select * from employee
--例 等到晚上11 点零8 分后才执行SELECT 语句
waitfor time ’23:08:00’
select * from employee
***SELECT***
select *(列名) from table_name(表名) where column_name operator value
ex:(宿主)
select * from stock_information where stockid = str(nid)
stockname = 'str_name'
stockname like '% find this %'
stockname like '[a-zA-Z]%' --------- ([]指定值的范围)
stockname like '[^F-M]%' --------- (^排除指定范围)
--------- 只能在使用like关键字的where子句中使用通配符)
or stockpath = 'stock_path'
or stocknumber < 1000
and stockindex = 24
not stock*** = 'man'
stocknumber between 20 and 100
stocknumber in(10,20,30)
order by stockid desc(asc) --------- 排序，desc-降序，asc-升序
order by 1,2 --------- by列号
stockname = (select stockname from stock_information where stockid = 4)
--------- 子查询
--------- 除非能确保内层select只返回一个行的值，
--------- 否则应在外层where子句中用一个in限定符
select distinct column_name form table_name --------- distinct指定检索独有的列值，不重复
select stocknumber ,"stocknumber + 10" = stocknumber + 10 from table_name
select stockname , "stocknumber" = count(*) from table_name group by stockname
--------- group by 将表按行分组,指定列中有相同的值
having count(*) = 2 --------- having选定指定的组
select *
from table1, table2
where table1.id *= table2.id -------- 左外部连接，table1中有的而table2中没有得以null表示
table1.id =* table2.id -------- 右外部连接
select stockname from table1
union [all] ----- union合并查询结果集，all-保留重复行
select stockname from table2
***insert***
insert into table_name (Stock_name,Stock_number) value ("xxx","xxxx")
value (select Stockname , Stocknumber from Stock_table2)---value为select语句
***update***
update table_name set Stockname = "xxx" [where Stockid = 3]
Stockname = default
Stockname = null
Stocknumber = Stockname + 4
***delete***
delete from table_name where Stockid = 3
truncate table_name ----------- 删除表中所有行，仍保持表的完整性
drop table table_name --------------- 完全删除表
***alter table*** --- 修改数据库表结构
alter table database.owner.table_name add column_name char(2) null .....
sp_help table_name ---- 显示表已有特征
create table table_name (name char(20), age smallint, lname varchar(30))
insert into table_name select ......... ----- 实现删除列的方法（创建新表）
alter table table_name drop constraint Stockname_default ---- 删除Stockname的default约束
***function(/*常用函数*/)***
----统计函数----
AVG --求平均值
COUNT --统计数目
MAX --求最大值
MIN --求最小值
SUM --求和
--AVG
use pangu
select avg(e_wage) as dept_avgWage
from employee
group by dept_id
--MAX
--求工资最高的员工姓名
use pangu
select e_name
from employee
where e_wage =
(select max(e_wage)
from employee)
--STDEV()
--STDEV()函数返回表达式中所有数据的标准差
--STDEVP()
--STDEVP()函数返回总体标准差
--VAR()
--VAR()函数返回表达式中所有值的统计变异数
--VARP()
--VARP()函数返回总体变异数
----算术函数----
/***三角函数***/
SIN(float_expression) --返回以弧度表示的角的正弦
COS(float_expression) --返回以弧度表示的角的余弦
TAN(float_expression) --返回以弧度表示的角的正切
COT(float_expression) --返回以弧度表示的角的余切
/***反三角函数***/
ASIN(float_expression) --返回正弦是FLOAT 值的以弧度表示的角
ACOS(float_expression) --返回余弦是FLOAT 值的以弧度表示的角
ATAN(float_expression) --返回正切是FLOAT 值的以弧度表示的角
ATAN2(float_expression1,float_expression2)
--返回正切是float_expression1 /float_expres-sion2的以弧度表示的角
DEGREES(numeric_expression)
--把弧度转换为角度返回与表达式相同的数据类型可为
--INTEGER/MONEY/REAL/FLOAT 类型
RADIANS(numeric_expression) --把角度转换为弧度返回与表达式相同的数据类型可为
--INTEGER/MONEY/REAL/FLOAT 类型
EXP(float_expression) --返回表达式的指数值
LOG(float_expression) --返回表达式的自然对数值
LOG10(float_expression)--返回表达式的以10 为底的对数值
SQRT(float_expression) --返回表达式的平方根
/***取近似值函数***/
CEILING(numeric_expression) --返回>=表达式的最小整数返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
FLOOR(numeric_expression) --返回<=表达式的最小整数返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
ROUND(numeric_expression) --返回以integer_expression 为精度的四舍五入值返回的数据
--类型与表达式相同可为INTEGER/MONEY/REAL/FLOAT 类型
ABS(numeric_expression) --返回表达式的绝对值返回的数据类型与表达式相同可为
--INTEGER/MONEY/REAL/FLOAT 类型
SIGN(numeric_expression) --测试参数的正负号返回0 零值1 正数或-1 负数返回的数据类型
--与表达式相同可为INTEGER/MONEY/REAL/FLOAT 类型
PI() --返回值为π 即3.1415926535897936
RAND([integer_expression]) --用任选的[integer_expression]做种子值得出0-1 间的随机浮点数
----字符串函数----
ASCII() --函数返回字符表达式最左端字符的ASCII 码值
CHAR() --函数用于将ASCII 码转换为字符
--如果没有输入0 ~ 255 之间的ASCII 码值CHAR 函数会返回一个NULL 值
LOWER() --函数把字符串全部转换为小写
UPPER() --函数把字符串全部转换为大写
STR() --函数把数值型数据转换为字符型数据
LTRIM() --函数把字符串头部的空格去掉
RTRIM() --函数把字符串尾部的空格去掉
LEFT(),RIGHT(),SUBSTRING() --函数返回部分字符串
CHARINDEX(),PATINDEX() --函数返回字符串中某个指定的子串出现的开始位置
SOUNDEX() --函数返回一个四位字符码
--SOUNDEX函数可用来查找声音相似的字符串但SOUNDEX函数对数字和汉字均只返回0 值
DIFFERENCE() --函数返回由SOUNDEX 函数返回的两个字符表达式的值的差异
--0 两个SOUNDEX 函数返回值的第一个字符不同
--1 两个SOUNDEX 函数返回值的第一个字符相同
--2 两个SOUNDEX 函数返回值的第一二个字符相同
--3 两个SOUNDEX 函数返回值的第一二三个字符相同
--4 两个SOUNDEX 函数返回值完全相同
QUOTENAME() --函数返回被特定字符括起来的字符串
/*select quotename('abc', '{') quotename('abc')
运行结果如下
----------------------------------{
{abc} [abc]*/
REPLICATE() --函数返回一个重复character_expression 指定次数的字符串
/*select replicate('abc', 3) replicate( 'abc', -2)
运行结果如下
----------- -----------
abcabcabc NULL*/
REVERSE() --函数将指定的字符串的字符排列顺序颠倒
REPLACE() --函数返回被替换了指定子串的字符串
/*select replace('abc123g', '123', 'def')
运行结果如下
----------- -----------
abcdefg*/
SPACE() --函数返回一个有指定长度的空白字符串
STUFF() --函数用另一子串替换字符串指定位置长度的子串
----数据类型转换函数----
CAST() 函数语法如下
CAST() (<expression> AS <data_ type>[ length ])
CONVERT() 函数语法如下
CONVERT() (<data_ type>[ length ], <expression> [, style])
select cast(100+99 as char) convert(varchar(12), getdate())
运行结果如下
------------------------------ ------------
199 Jan 15 2000
----日期函数----
DAY() --函数返回date_expression 中的日期值
MONTH() --函数返回date_expression 中的月份值
YEAR() --函数返回date_expression 中的年份值
DATEADD(<datepart> ,<number> ,<date>)
--函数返回指定日期date 加上指定的额外日期间隔number 产生的新日期
DATEDIFF(<datepart> ,<number> ,<date>)
--函数返回两个指定日期在datepart 方面的不同之处
DATENAME(<datepart> , <date>) --函数以字符串的形式返回日期的指定部分
DATEPART(<datepart> , <date>) --函数以整数值的形式返回日期的指定部分
GETDATE() --函数以DATETIME 的缺省格式返回系统当前的日期和时间
----系统函数----
APP_NAME() --函数返回当前执行的应用程序的名称
COALESCE() --函数返回众多表达式中第一个非NULL 表达式的值
COL_LENGTH(<'table_name'>, <'column_name'>) --函数返回表中指定字段的长度值
COL_NAME(<table_id>, <column_id>) --函数返回表中指定字段的名称即列名
DATALENGTH() --函数返回数据表达式的数据的实际长度
DB_ID(['database_name']) --函数返回数据库的编号
DB_NAME(database_id) --函数返回数据库的名称
HOST_ID() --函数返回服务器端计算机的名称
HOST_NAME() --函数返回服务器端计算机的名称
IDENTITY(<data_type>[, seed increment]) [AS column_name])
--IDENTITY() 函数只在SELECT INTO 语句中使用用于插入一个identity column列到新表中
/*select identity(int, 1, 1) as column_name
into newtable
from oldtable*/
ISDATE() --函数判断所给定的表达式是否为合理日期
ISNULL(<check_expression>, <replacement_value>) --函数将表达式中的NULL 值用指定值替换
ISNUMERIC() --函数判断所给定的表达式是否为合理的数值
NEWID() --函数返回一个UNIQUEIDENTIFIER 类型的数值
NULLIF(<expression1>, <expression2>)
--NULLIF 函数在expression1 与expression2 相等时返回NULL 值若不相等时则返回expression1 的值
精妙SQL语句
说明：复制表(只复制结构,源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
说明：拷贝表(拷贝数据,源表名：a 目标表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
说明：显示文章、提交人和最后回复时间
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
说明：外连接查询(表名1：a 表名2：b)
SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c
说明：日程安排提前五分钟提醒
SQL: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5
说明：两张关联表，删除主表中已经在副表中没有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
说明：--
SQL:
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
FROM TABLE1,
(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE, 'YYYY/MM')) X,
(SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM') || '/01','YYYY/MM/DD') - 1, 'YYYY/MM') ) Y,
WHERE X.NUM = Y.NUM （+）
AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B
WHERE A.NUM = B.NUM
说明：--
SQL:
select * from studentinfo where not exists (select * from student where studentinfo.id=student.id) and 系名称='"& strdepartmentname&"' and 专业名称='"&strprofessionname& "' order by 性别,生源地,高考总成绩
说明：
从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源）
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
FROM TELFEESTAND a, TELFEE b
WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy')
说明：四表联查问题：
SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
说明：得到表中最小的未使用的ID号
SQL:
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)
: 我在ms sql中建了一个表,可由于种种原因有些记录重复了
: 记录完全的一模一样。
: 现在我想把重复的都删掉,只保留重复记录中的第一条。
: 我在database好象看到有介绍oracle的，
select distinct * into #table_name from table_name
delete from table_name
select * into table_name from #table_name
drop table #table_name
与此相关的是“select into”选项，可以在数据库属性
对话框中，勾起来此项，或者在Query Analyzer中执行
execute sp_dboption 'db_name','select into','true'
开启。默认值是关闭的。
SQL:SELECT NEWID()
自连接取出荣于数据
把所有姓名相同的只取出一个
select a.name from table_name a where a.id in
(select b.id from table_name b where a.id<>b.id)
同理删除荣誉数据
delete from table_name where table_name.id in
(select b.id from table_name b where table_name.id<>b.id)
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
选择在每一组b值相同的数据中对应的a最大的(换成average或别的函数或子查询,你会有意想不到的发现)记录的所有信息.
类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.
上面的许多同志对子查询存在有偏见与误解,其实在一个好的数据分析程序中,子查询可以简化很多程序逻辑.
获益不浅啊.
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
:)
cpp2017(长安不见使人愁)这么长一句，少见，能否介绍介绍它的功力？^_^
SELECT DISTINCT TSD.Time_Sheet_Dtl_Record_No,TSD.User_Record_No,TP.Period_Start_Date ,TP.Period_End_Date INTO #temp FROM Time_Sheet_Details TSD, Time_Sheet_Period TP ,User_Group_User_Relationship UGUR,User_Group_Master UGM ,User_Data_Access_Right UDAR WHERE TSD.status ='TS_WFMGRA' AND DATEDIFF(dd,TP.period_start_date,TSD.work_Date)>=0 AND DATEDIFF(dd,TP.period_end_date,TSD.work_Date)<=0 AND UGUR.User_Record_No = TSD.User_Record_No AND UGM.User_Group_Record_No=UGUR.User_Group_Record_No AND UGM.User_Group_Name IN('Technician','Engineer') AND UDAR.User_Record_No = TSD.User_Record_No AND UDAR.Division_Record_No IN(1) SELECT DISTINCT A.User_Record_No, B.Staff_No, B.Full_Name,B.Job_Title, SUM(working_hour) AS Working_Hours,SUM(ot) AS OT_HOURS, C.Period_Start_Date,C.Period_End_Date INTO #temp2 FROM Time_Sheet_Details A INNER JOIN User_Master B ON B.User_Record_No= A.User_Record_No INNER JOIN #temp C ON C.Time_Sheet_Dtl_Record_No = A.Time_Sheet_Dtl_Record_No GROUP BY A.User_Record_No, B.Staff_No,B.Full_Name,B.Job_Title, C.Period_Start_Date,C.Period_End_Date HAVING COUNT(*) = DATEDIFF(d,C.Period_Start_Date,C.Period_End_Date)+1 Select A.User_Record_No,A.Staff_No,A.Full_Name,A.Job_Title ,A.Working_Hours,A.OT_HOURS,A.Period_Start_Date,A.Period_End_Date ,DM.Division_Code INTO #temp3 FROM #temp2 AS A INNER JOIN User_Data_Access_Right UDAR ON UDAR.User_Record_No = A.User_Record_No INNER JOIN Division_Master DM ON DM.Division_Record_No = UDAR.Division_Record_No SELECT * From #temp3 order by 1,7,8; Select Count(Distinct User_Record_No+Period_Start_Date+Period_End_Date) From #temp3 DROP TABLE #temp ,#temp2,#temp3
pwdencrypt
密码加密？
有些什么作用，不明白
随机取出10条数据
select top 10 * from tablename order by newid()
功能：
type vender pcs
电脑 A 1
电脑 A 1
光盘 B 2
光盘 A 2
手机 B 3
手机 C 3
select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type
Microsoft SQL Server是如何加密口令的？未公开的加密函数？
如果对MSSQL的用户信息有兴趣的，可能会发现master.dbo.sysxlogins里面存放着用户的口令，可是呢，password字段如果不是null就是一堆看不懂的binary，这个口令是怎么加密的呢？
其实只要仔细看看master.dbo.sp_addlogin就知道了，MSSQL的sp都可以看到代码，真是不错。
让我们来看看它是怎么做的，注意这一行select @passwd = pwdencrypt(@passwd)，这个时后@passwd就被加密了，让我们也来试一下
DECLARE @ClearPWD varchar(255)
DECLARE @EncryptedPWD varbinary(255)
SELECT @ClearPWD = 'test'
SELECT @EncryptedPWD = CONVERT(varbinary(255), pwdencrypt(@ClearPWD))
SELECT @EncryptedPWD
看上去不错，确实被加密了，可是我怎么还原呢？
呵呵，这就没戏了，口令加密都是单向的，用加密后的密文来比较就可以了。
继续看看其它用户相关的sp，可以发现master.dbo.sp_password里面有口令比较的内容。
pwdcompare(@old, password, (CASE WHEN xstatus&2048 = 2048 THEN 1 ELSE 0 END))
不用去理会xstatus，这是一个状态掩码，一般我们用的时候就直接用0就可以了
DECLARE @ClearPWD varchar(255)
DECLARE @EncryptedPWD varbinary(255)
SELECT @ClearPWD = 'test'
SELECT @EncryptedPWD = CONVERT(varbinary(255), pwdencrypt(@ClearPWD))
SELECT pwdcompare(@ClearPWD, @EncryptedPWD, 0)
SELECT pwdcompare('ErrorPassword', @EncryptedPWD, 0)
这样我们就可以使用这两个函数来加密自己的密码了，怎么样，还不错吧？
引用自
http://www.bgchina.com/daily/bd_1/
SELECT语法：(基本)
SELECT [DISTINCT]
(column [{, column } ] )| *
FROM table [ { , table} ]
[ORDER BY column [ASC] | [DESC
[{ , column [ASC] | [DESC } ] ]
WHERE predicate [ { logical-connector predicate } ];
------------------------------------------------------
INSERT语法：
INSERT INTO table
[(column { ,column})]
VALUES
(columnvalue [{,columnvalue}]);
------------------------------------------------------
UPDATE语法：
UPDATE table
SET column = value [{, column = value}]
[ WHERE predicate [ { logical-connector predicate}]];
------------------------------------------------------
DELETE语法：
DELETE FROM table
[WHERE predicate [ { logical-connector predicate} ] ];
------------------------------------------------------
常识补充
统计函数：
AVG(字段名) 得出一个表格栏平均值
COUNT(*|字段名) 对数据行数的统计或对某一栏有值的数据行数统计
MAX(字段名) 取得一个表格栏最大的值
MIN(字段名) 取得一个表格栏最小的值
SUM(字段名) 把数据栏的值相加
eg：
sql="select sum(字段名) as 别名 from 数据表 where 条件表达式"
select name from sysobjects where type='U''列出数据库里所有的表名
select name from syscolumns where id=object_id('TableName')'列出表里的所有的
source data
kzx4dm xbdm jylsfsdm ...
11 2 10
11 2 10
12 2 10
12 1 20
12 1 20
destination:
kzx4dm bys_count yjs_count jy_ratio
11 2 2 1.00
12 3 1 1/3
SELECT DISTINCT kzx4dm,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm) AS bys_count,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm WHERE jylsfsdm=10) AS yjs_count,yjs_count/bys_count AS jy_ratio
FROM tablename AS TA
SELECT DISTINCT kzx4dm,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm) AS bys_count,(SELECT COUNT(jylsfsdm) FROM tablename WHERE kzx4dm=TA.kzx4dm AND jylsfsdm=10) AS yjs_count,yjs_count/bys_count AS jy_ratio
FROM tablename AS TA
二维表 T(F1,F2,F3,F4,F5,F6,F7) 表示如下关系:
学生ID 学生姓名 课程ID 课程名称 成绩 教师ID 教师姓名
S3 王五 K4 政治 53 T4 赵老师
S1 张三 K1 数学 61 T1 张老师
S2 李四 K3 英语 88 T3 李老师
S1 张三 K4 政治 77 T4 赵老师
S2 李四 K4 政治 67 T5 周老师
S3 王五 K2 语文 90 T2 王老师
S3 王五 K1 数学 55 T1 张老师
S1 张三 K2 语文 81 T2 王老师
S4 赵六 K2 语文 59 T1 王老师
S1 张三 K3 英语 37 T3 李老师
S2 李四 K1 数学 81 T1 张老师
请以一句 T-SQL (Ms SQL Server) 或 Jet SQL (Ms Access) 在 原表 T 基础上作答
1.如果 T 表还有一字段 F0 数据类型为自动增量整型(唯一,不会重复),
而且 T 表中含有除 F0 字段外,请删除其它字段完全相同的重复多余的脏记录数据:
delete from t where f0 in(select max(f0) from t group by f1,f2,f3,f4,f5,f6,f7 having count(f0)>1)
2.列印各科成绩最高和最低的记录: (就是各门课程的最高、最低分的学生和老师)
课程ID,课程名称,最高分,学生ID,学生姓名,教师ID,教师姓名,最低分,学生ID,学生姓名,教师ID,教师姓名
select tb.f4,tb.f3,tb1.f5,tb.f1,tb.f2,tb.f6,tb.f7,tb2.f5,tb2.f1,tb2.f2,tb2.f6,tb2.f7 from t tb where
f5=(select max(f5) from t where t.f4=tb.f4)
join select f2,f7 from t tb2 where
f5=(select min(f5) from t where t.f4=tb2.f4)
on tb.f4=tb2.f4
先完成一个,想想在做下一个.
3.按成绩从高到低顺序,列印所有学生四门(数学,语文,英语,政治)课程成绩: (就是每个学生的四门课程的成绩单)
学生ID,学生姓名,数学,语文,英语,政治,有效课程数,有效平均分
(注: 有效课程即在 T 表中有该学生的成绩记录,如不明白可不列印"有效课程数"和"有效平均分")
select tb1.f1,tb1.f2,count(tb1.f5) as scores,sum(tb1.f5) as scoresum, avg(tb1.f5) AS average,
tb2.f5,tb3.f5,tb4.f5,tb5.f5
from t as tb1
left join t as tb2
on tb1.f0=tb2.f0 and tb2.f3=k4
left join t as tb3
on tb1.f0=tb3.f0 and tb3.f3=k3
left join t as tb4
on tb1.f0=tb4.f0 and tb4.f3=k2
left join t as tb5
on tb1.f0=tb5.f0 and tb5.f3=k1
grout by tb1.f2 order by tb1.scoresum desc
4.按各科不及格率的百分数从低到高和平均成绩从高到低顺序,统计并列印各科平均成绩和不及格率的百分数(用"N行"表示): (就是分析哪门课程难)
课程ID,课程名称,平均成绩,及格百分数
select f3,f4, (select count(f1) from t where t.f4=tb.f4 and f5<60)/(select count(f1) from t where t.f4=tb.f4) as failper,((select sum(f5) from t where t.f4=tb.f4)/ (select count(f5) from t where t.f4=tb.f4)) as averagescore
from t tb order by failper asc, as averagescore desc
/****** Object: Stored Procedure dbo.dt_checkoutobject Script Date: 2003-3-12 9:25:26 ******/
create proc dbo.dt_checkoutobject
@chObjectType char(4),
@vchObjectName varchar(255),
@vchComment varchar(255),
@vchLoginName varchar(255),
@vchPassword varchar(255),
@iVCSFlags int = 0,
@iActionFlag int = 0/* 0 => Checkout, 1 => GetLatest, 2 => UndoCheckOut */
as
set nocount on
declare @iReturn int
declare @iObjectId int
select @iObjectId =0
declare @VSSGUID varchar(100)
select @VSSGUID = 'SQLVersionControl.VCS_SQL'
declare @iReturnValue int
select @iReturnValue = 0
declare @vchTempText varchar(255)
/* this is for our strings */
declare @iStreamObjectId int
select @iStreamObjectId = 0
declare @iPropertyObjectId int
select @iPropertyObjectId = (select objectid from dbo.dtproperties where property = 'VCSProjectID')
declare @vchProjectName varchar(255)
declare @vchSourceSafeINI varchar(255)
declare @vchServerName varchar(255)
declare @vchDatabaseName varchar(255)
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSProject', @vchProjectName OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSourceSafeINI', @vchSourceSafeINI OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSQLServer', @vchServerName OUT
exec dbo.dt_getpropertiesbyid_vcs @iPropertyObjectId, 'VCSSQLDatabase', @vchDatabaseName OUT
if @chObjectType = 'PROC'
begin
/* Procedure Can have up to three streams
Drop Stream, Create Stream, GRANT stream */
exec @iReturn = sp_OACreate @VSSGUID, @iObjectId OUT
if @iReturn <> 0 GOTO E_OAError
exec @iReturn = sp_OAMethod @iObjectId,
'CheckOut_StoredProcedure',
NULL,
@sProjectName = @vchProjectName,
@sSourceSafeINI = @vchSourceSafeINI,
@sObjectName = @vchObjectName,
@sServerName = @vchServerName,
@sDatabaseName = @vchDatabaseName,
@sComment = @vchComment,
@sLoginName = @vchLoginName,
@sPassword = @vchPassword,
@iVCSFlags = @iVCSFlags,
@iActionFlag = @iActionFlag
if @iReturn <> 0 GOTO E_OAError
exec @iReturn = sp_OAGetProperty @iObjectId, 'GetStreamObject', @iStreamObjectId OUT
if @iReturn <> 0 GOTO E_OAError
create table #commenttext (id int identity, sourcecode varchar(255))
select @vchTempText = 'STUB'
while @vchTempText IS NOT NULL
begin
exec @iReturn = sp_OAMethod @iStreamObjectId, 'GetStream', @iReturnValue OUT, @vchTempText OUT
if @iReturn <> 0 GOTO E_OAError
if (@vchTempText IS NOT NULL) insert into #commenttext (sourcecode) select @vchTempText
end
select 'VCS'=sourcecode from #commenttext order by id
select 'SQL'=text from syscomments where id = object_id(@vchObjectName) order by colid
end
CleanUp:
return
E_OAError:
exec dbo.dt_displayoaerror @iObjectId, @iReturn
GOTO CleanUp
GO
1.如果 T 表还有一字段 F0 数据类型为自动增量整型(唯一,不会重复),
而且 T 表中含有除 F0 字段外,请删除其它字段完全相同的重复多余的脏记录数据:
delete from t where f0 in(select max(f0) from t group by f1,f2,f3,f4,f5,f6,f7 having count(f0)>1)
上面这个sql有问题
正确的如下
DELETE Legal_Dispute_Lawyer WHERE Lawyer_Record_No IN(SELECT Lawyer_Record_No FROM Legal_Dispute_Lawyer LDL WHERE Lawyer_Record_No(SELECT TOP 1 Lawyer_Record_No FROM Legal_Dispute_Lawyer WHERE LD=LDL.LD AND Name=LDL.Name AND Email=LDL.Email AND Phone_No=LDL.Phone_No AND Fax_No=LDL.Fax_No))
消除Legal_Dispute_Lawyer 表中除Lawyer_Record_No(自增字段)外其余数据完全相同的记录.
表结构如下
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Legal_Dispute_Lawyer]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Legal_Dispute_Lawyer]
GO
CREATE TABLE [dbo].[Legal_Dispute_Lawyer] (
[Lawyer_Record_No] [int] IDENTITY (1, 1) NOT NULL ,
[LD] [int] NOT NULL ,
[Name] [int] NOT NULL ,
[Phone_No] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
[Fax_No] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
[varchar] (255) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO
以这种方式还可以实现组内消除重复值..
Top
DELETE Legal_Dispute_Lawyer WHERE Lawyer_Record_No IN(SELECT Lawyer_Record_No FROM Legal_Dispute_Lawyer LDL WHERE Lawyer_Record_No<>(SELECT TOP 1 Lawyer_Record_No FROM Legal_Dispute_Lawyer WHERE LD=LDL.LD AND Name=LDL.Name AND Email=LDL.Email AND Phone_No=LDL.Phone_No AND Fax_No=LDL.Fax_No))
table1
kzx4dm xbdm jylsfsdm ...
10 2 8
11 2 9
12 2 19
13 1 18
14 1 19
select top 3 with ties jylsfsdm from table1
结果：
kzx4dm xbdm jylsfsdm ...
12 2 19
14 1 19
13 1 18
11 2 9
说明：取出并列排行的所有记录
Top
回复人： lsqteng(阿琦) ( ) 信誉：102 2003-3-21 14:18:11 得分:0
说到语法我就来兴趣了，哈哈，请看:
SELECT statement::=
<query_experssion>
[ORDER BY {order_by_expression|Column_position[ASC|DESC]}
[,...n]]
[COMPUTE
{{AVG|COUNT|MAX|MIN|SUM}(exression)}[,...n]
[BY expression[,...n]]
]
[FOR {BROWSE |XML{RAW|AUTO|EXPLICIT}
[,XMLDATA]
[,ELEMENTS]
[,BINARY base64]
}
]
[OPTION(<query_hint>[,...n])]
<query expression>::=
{<query specification>|(<query expression>)}
[UNION[ALL]<query specification|(<query expression<)[...n]]
<query specification>::=
SELECT [ALL|DISTINCT]
[{TOP integer|TOP integer PERCENT}[WITH TIES]]
<select _list>
[INTO new_table]
[FROM{<table_source>}[,...n]]
[WHERE <search_condition>]
[GROUP BY [ALL]group_by_expression[,...n]
[WITH{CUBE|ROLLUP}]
]
[HAVING<search_condition>}
哎，行了吧，这还是select 语句的形式。要看完全的，喔，那可不得了喔。我不写了，累死了，呵呵
create table IKnowYou
(userid varchar(30),
TableName varchar(50),
Action varchar(6),
DateT datatime,
TrrigerTableColumns.....,
TrrigerTableColumns.....)
create trriger Who_Do_It on table
for update
as
declare userid varchar(30)
declare TableName varchar(50)
declare Action varchar(6)
userid=@@suser_sname
Action='update'
TableName='tabel'
insert into IKnowYou values(userid,TableName,Action,Now,select * from deleted,select * from inserted)
kill all connections to a given databse
CREATE PROCEDURE usp_killDBConnections @DBName varchar(50), @withmsg bit=1
AS
SET NOCOUNT ON
DECLARE @spidstr varchar(8000)
DECLARE @ConnKilled smallint
SET @ConnKilled=0
SET @spidstr = ''
IF db_id(@DBName) < 4
BEGIN
PRINT 'Connections to system databases cannot be killed'
RETURN
END
SELECT @spidstr=coalesce(@spidstr,',' )+'kill '+convert(varchar, spid)+ '; '
FROM master..sysprocesses WHERE dbid=db_id(@DBName)
IF LEN(@spidstr) > 0
BEGIN
EXEC(@spidstr)
SELECT @ConnKilled = COUNT(1)
FROM master..sysprocesses WHERE dbid=db_id(@DBName)
END
IF @withmsg =1
PRINT CONVERT(VARCHAR(10), @ConnKilled) + ' Connection(s) killed for DB ' + @DBName
GO
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE
FROM TABLE1,
(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE
FROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE, 'YYYY/MM')) X,
(SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2
WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, 'YYYY/MM') ¦¦ '/01','YYYY/MM/DD') - 1, 'YYYY/MM') ) Y,
WHERE X.NUM = Y.NUM （+）
AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B
WHERE A.NUM = B.NUM
SELECT * FROM table ORDER BY id
SELECT * FROM table ORDER BY id DESC
正反排序,厉害吧!
select * into b from a where 1<>1
这样生成的b表访问的用户没有select的权限？
请问sql DX们这个问题怎么解决？
Select left(field,1) as field1 from table_name order by field desc
select count(clubmember.clubid)as hot,clubmember.clubid,clubinfo.clubid,clubinfo.name from clubmember,clubinfo where clubinfo.clubid=clubmember.clubid group by clubmember.clubid order by hot DESC limit 10
条件删除
DELETE DBO.TEMP WHERE FLD_CHARACTER IN
(
SELECT FLD_CHARACTER
FROM dbo.TBL_CHARACTER
WHERE (FLD_DELETED = 1) AND (FLD_LEVEL <= 18) AND
(FLD_UPDATEDATETIME <= GETDATE() - 5)
)
选择前数据库里前10条记录：
1、select top 10 * from table
2、set rowcount 10
select * from table
今天才把合计函数搞定：
Set rs=conn.execute("Select min(id) as minID from TABLE") ^_^
select * from 日程安排 where datediff('minute',f开始时间,getdate())>5
日程安排提前五分钟提醒。
select * into b from a where 1<>1
这样生成的b表访问的用户没有select的权限？
请问sql DX们这个问题怎么解决？
指定dbo前缀应该可以解决问题了..
mark!
<%
'取出随机记录
Randomize
RNumber = Int(Rnd*200) + 1
SQL = "SELECT * FROM Customers WHERE ID = " & RNumber
set objRec = ObjConn.Execute(SQL)
Response.WriteRNumber & " = " & objRec("ID") & " " & objRec("c_email")
%>
insert into pbrule(newrid,subj,bz,zf,orid,rstat,layer,bid) select newrid,subj,bz,zf,orid,rstat,layer,bid from pbrule1 where bruleid=bruleid
将pbrule1 表中符合条件的记录 导入 pbrule表中
下面这个更实用，就是两张关联表，删除主表中已经在副表中没有的信息
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
这条语句就是删除 INFO表中infid字段在infobz中不存在的记录
此语句用来维护数据库很有用哦。
楼主给点分吧
CREATE OR REPLACE PROCEDURE DUMP_TO_WEB_TCLHD_SP_OBJ
AS
BEGIN
CALC_PIA_PRICE ;
DELETE FROM TCLHD_SP_OBJ ;
INSERT INTO TCLHD_SP_OBJ (NAME,CODE,ID,PRICE,TYPE,FIELDS) (
SELECT c.DESCRIPTION,C.SEGMENT1,a.INVENTORY_ITEM_ID, nvl(c.ATTRIBUTE14,'0'),0,nvl(c.ATTRIBUTE13,0)
from mtl_item_categories a , mtl_categories b , mtl_system_items c
where a.CATEGORY_ID = b.CATEGORY_ID and b.SEGMENT1='原材料'
and a.INVENTORY_ITEM_ID = c.INVENTORY_ITEM_ID AND A.ORGANIZATION_ID = 21
and c.ORGANIZATION_ID = 21 and c.inventory_item_status_code = 'Active' );
COMMIT ;
END ;
数据库IBM DB2 》》》SQL
绝对精华
select dmbh,SJDM,flsm,dmzz from ydm where dmbh=3300
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh=3300)
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300)))
union all
select dmbh,SJDM,flsm,dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))))
**********************************
select SJDM from ydm where dmbh=3300
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh=3300)
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300)))
union all
select SJDM from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in
(select dmzz from ydm where dmbh in (
select dmzz from ydm where dmbh=3300))))
**************************************************
SELECT COUNT(*) as yhs ,SUM(DF) as df FROM DB2.DFTDF
WHERE (year(rq)*12+month(rq)) between 24015 and 24015
AND dflb=513
and (ZHH,YYH) IN
(SELECT ZHH,YYxH FROM DB2.YDD111 WHERE HYM in
( select SJDM from DB2.ydm where dmbh=3200
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200)
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200))
union all
select SJDM from DB2.ydm where dmbh in (
Select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200)))
union all
select SJDM from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh in (
select dmzz from DB2.ydm where dmbh=3200))))
))
***********************************************
select bcm,bsm,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm
from jldb) as jldb2
group by bcm,bsm
select bcm,bsm,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm
from jldb
where bzt='OK' and qyrq between '1999-1-1' and '2003-1-3' ) as jldb2
group by bcm,bsm
****************
select bcm,bsm,bxh,count(bsm) as sl
from (
select bcm,case
when blx='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%'
then 'JJB'
else 'DZB'
end as bsm,bxh
from jldb
where bzt='OK' and qyrq between '1999-1-1' and '2003-1-3' ) as jldb2
group by bcm,bxh,bsm
**********************************************
with ttt as (select bcm,bxh,bsm,count(bsm) as sl from (select bcm,bxh,case when blx ='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%' then '机械表 ' else 'DZB' end
as bsm from jldb where bzt='OK' and qyrq<='2002-2-2' ) as jldb2 group by bcm,bxh,bsm),
sss as (select bcm,bxh,bsm,count(bsm) as sl1 from (select bcm,bxh,case when blx ='DXB' and bxh like 'DD%' AND BXH NOT LIKE 'DDS%' then '机械表 ' else 'DZB' end
as bsm from jldb where bzt='OK' and qyrq<='2000-1-1' ) as jldb2 group by bcm,bxh,bsm)
select ttt.bcm,ttt.bxh,ttt.bsm,value(ttt.sl,0) as sl1,value(sss.sl1,0) as sl2,(value(ttt.sl,0)-value(sss.sl1,0)) as sl3 from ttt full join sss
on sss.bxh=ttt.bxh and sss.bcm=ttt.bcm and sss.bsm=ttt.bsm order by ttt.bcm,ttt.bxh,ttt.bsm
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
选择在每一组b值相同的数据中对应的a最大的(换成average或别的函数或子查询,你会有意想不到的发现)记录的所有信息.
类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.
上面的许多同志对子查询存在有偏见与误解,其实在一个好的数据分析程序中,子查询可以简化很多程序逻辑.
<%
'取出随机记录
Randomize
RNumber = Int(Rnd*200) + 1
SQL = "SELECT * FROM Customers WHERE ID = " & RNumber
set objRec = ObjConn.Execute(SQL)
Response.WriteRNumber & " = " & objRec("ID") & " " & objRec("c_email")
%>
这种方法存在bug,有可能取不出数据来，
最好还是还
select top 1 * from tablename order by newid()
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
这可是一个经典的SQL.
大概再加几层嵌套,查询引擎都可以崩溃了..
下面的语句不是精华.但是却是用很多用T-SQL进行开发的同志所不了解的..
如何更新nText,Text,Image字段数据..
DECLARE @ptrval binary(16)
SELECT @ptrval = TEXTPTR(LSD_Comment)
FROM Legal_Dispute WHERE LD_Record_No=25 --得到指定记录的nText文本指针
UPDATETEXT Legal_Dispute.LSD_Comment @ptrval 0 0 N'Insert Text Content Into Old Content Before' ---将数据插入在老数据之前.
很多同志在更新nText字段的时候使用一个记录集取回ASP然后一次性用"UPDATE set fieldname='" & new content & old content & "'"的方式实现..
却不知道,sql string一次只能提交的string是有限制的,这样一来,实际的text,ntext永远也不可能存储它所支持的最大长度的数据..也远远不能达到使用nText字段的目的了..
Top
回复人： jtmoon(逍遥小贼) ( ) 信誉：234 2003-3-26 12:50:27 得分:0
呵呵，不错啊，收藏
Top
回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-3-26 17:49:24 得分:0
有好料快点贴，不久要揭贴喽!
Top
回复人： chinahuman(枯) ( ) 信誉：105 2003-3-26 19:36:33 得分:0
高手们来看一看这个问题了http://expert.csdn.net/Expert/topic...xml?temp=5.489528E-03
在线等了！
Top
回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-26 21:12:14 得分:0
to 上面的兄弟
SELECT * INTO [D:\database.mdb].table4 FROM [C:\database.mdb].table1
前提是ASP用户对后者有读权限.
前者有写权限
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回复人： guiguai(鬼怪) ( ) 信誉：101 2003-3-26 22:09:06 得分:0
收藏！
Top
回复人： wertou() ( ) 信誉：100 2003-3-27 10:55:30 得分:0
select * from studentinfo where not exists (select * from student where studentinfo.id=student.id) and 系名称='"& strdepartmentname&"' and 专业名称='"&strprofessionname& "' order by 性别,生源地,高考总成绩
Top
回复人： Swanzy(志远) ( ) 信誉：100 2003-3-27 11:57:47 得分:0
请问查询时时有两行相同的记录，如何去掉一行？（其中包含TEXT数据类型）
select brepeople, 姓名,bbs_content.* from bbs_revert,bbs_content,bbs_userinfo where bauthor= 职员id and brepeople='m043' and bbs_content.id=bid
显示“我”参加的主题回复时，如果本主题回复了两次以上，那查询的结果将有两行以上的记录。
Top
回复人： huangang(H.G) ( ) 信誉：100 2003-3-27 12:08:42 得分:0
select * form a like %keywords%
模糊查询
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-27 12:20:43 得分:0
to Swanzy(志远)
包含有text类型数据是无法进行消除重复值处理的..
因为在sql server中text处理为一个指针..
读取并比较该字段需要专用的语法
如果要做,建议在存储过程中做或将该字段排除在比较条件外
Top
回复人： 98130(Oracle) ( ) 信誉：100 2003-3-27 12:41:06 得分:0
select * from
(select top 5 * from
(select * from
(select top 5 *
from GuestBook
where 1=1 and Deleted = false
order by GuestID desc)
order by GuestID asc)
order by GuestID asc)
order by GuestID desc
我怎么运行不了?
Top
回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-27 14:18:27 得分:0
to 98130(Oracle)
下面的可以.但是好象看起来很没有必要
select top 1 num1 from
(select top 5 num1 from
(select top 1 num1 from
(select top 5 num1
from table1
order by num1 desc) as a
order by num1 asc) as b
order by num1 asc) as c
order by num1 desc
Top
回复人： tigerflyfly(小飞虎) ( ) 信誉：100 2003-3-27 21:20:40 得分:0
取出最先的是select top * from tablename
取出最后的几条是什么？
Top
回复人： clipper_clipper(clipper_clipper) ( ) 信誉：104 2003-3-27 21:46:59 得分:0
select count(*) from tb_tablename
经常用的，取记录数
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回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-3-28 9:26:47 得分:0
t tigerflyfly(小飞虎)
还是用select top,只是排序倒过来即可，比如：
select top 10 * from tablename order by id desc
Top
回复人： entice(踏雪寻梅) ( ) 信誉：106 2003-3-28 9:27:16 得分:0
to tigerflyfly(小飞虎)
用排序呀。
Top
回复人： xiaojiyi(小己乙) ( ) 信誉：100 2003-3-28 11:15:44 得分:0
分页语句
select top 100 * from 表名 where id not in (select top page_no*100 * from 表名)
page_no是程序中的变量
Top
回复人： xiaoshi(js真痛苦!我要被炒了) ( ) 信誉：101 2003-3-28 11:42:47 得分:0
我收藏
中午来看
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:16:31 得分:0
从数据库直接输出XML数据:
select text1,text2 from table1 where text1 like '%alu_ok%' for xml auto
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回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:19:12 得分:0
UPDATE titles
SET t.ytd_sales = t.ytd_sales + s.qty
FROM titles t, sales s
WHERE t.title_id = s.title_id
AND s.ord_date = (SELECT MAX(sales.ord_date) FROM sales)
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回复人： PeterMCT(天天下雨1991) ( ) 信誉：101 2003-3-28 13:21:02 得分:0
up
Top
回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:21:07 得分:0
DELETE authors
FROM (SELECT TOP 10 * FROM authors) AS t1
WHERE authors.au_id = t1.au_id
Top
回复人： alu_ok(冬瓜茶) ( ) 信誉：100 2003-3-28 13:22:26 得分:0
初始化表table1
TRUNCATE TABLE table1
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回复人： lxxlily(笨鸟先飞) ( ) 信誉：107 2003-3-28 13:31:43 得分:0
cnuninet(www.helloaspx.com) :晕～～
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:11:57 得分:0
从入库信息表和入库清单表中得期初期末库存：
SELECT a.mattype as mattype, a.matname as matname, a.spec as spec,a.indate as indate, a.amount AS lastnum, a.matsum AS lastsum,
b.amount AS curnum, b.matsum AS cursum
FROM (SELECT a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm') AS indate,
SUM(b.amount) AS amount, SUM(b.matsum) AS matsum
FROM (SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) a,
(SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) b
WHERE TO_CHAR(b.indate, 'yyyy-mm') <= TO_CHAR(a.indate, 'yyyy-mm') AND
a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+)
GROUP BY a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm')) a,
---未完，待续
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:13:01 得分:0
---接上面
(SELECT a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm') AS indate,
SUM(b.amount) AS amount, SUM(b.matsum) AS matsum
FROM (SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount, SUM(nvl(a.matsum,
0) - NVL(b.matsum, 0) + NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) a,
(SELECT a.mattype, a.matname, a.spec, a.indate, SUM(nvl(a.amount, 0)
- NVL(b.amount, 0) + NVL(c.amount, 0)) AS amount,
SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0) + NVL(c.matsum, 0))
AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype = b.mattype (+) AND a.mattype = c.mattype (+) AND
a.matname = b.matname (+) AND a.matname = c.matname (+) AND
a.spec = b.spec (+) AND a.spec = c.spec (+) AND
a.indate = b.outdate (+) AND a.indate = c.backdate (+)
GROUP BY a.mattype, a.matname, a.spec, a.indate
UNION
SELECT b.mattype, b.matname, b.spec, b.outdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = b.mattype AND b.mattype = c.mattype (+) AND
a.matname (+) = b.matname AND b.matname = c.matname (+) AND
a.spec (+) = b.spec AND b.spec = c.spec (+) AND
a.indate (+) = b.outdate AND b.outdate = c.backdate (+)
GROUP BY b.mattype, b.matname, b.spec, b.outdate
UNION
SELECT c.mattype, c.matname, c.spec, c.backdate AS indate,
SUM(nvl(a.amount, 0) - NVL(b.amount, 0) + NVL(c.amount, 0))
AS amount, SUM(nvl(a.matsum, 0) - NVL(b.matsum, 0)
+ NVL(c.matsum, 0)) AS matsum
FROM (SELECT a.mattype AS mattype, a.matname AS matname,
a.spec AS spec, b.indate AS indate, a.amount AS amount,
a.matsum AS matsum, b.matsource AS matsource
FROM materialin a, matin b
WHERE b.serial = a.serial) a, matuse b, matback c
WHERE a.mattype (+) = c.mattype AND b.mattype (+) = c.mattype AND
a.matname (+) = c.matname AND c.matname = b.matname (+) AND
c.spec = a.spec (+) AND c.spec = b.spec (+) AND
c.backdate = b.outdate (+) AND c.backdate = a.indate (+)
GROUP BY c.mattype, c.matname, c.spec, c.backdate) b
WHERE TO_CHAR(b.indate, 'yyyy-mm') <= TO_CHAR(a.indate, 'yyyy-mm') AND
a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+)
GROUP BY a.mattype, a.matname, a.spec, TO_CHAR(a.indate, 'yyyy-mm'))
b
WHERE a.mattype = b.mattype (+) AND a.matname = b.matname (+) AND
a.spec = b.spec (+) AND TO_DATE(a.indate, 'yyyy-mm')
= ADD_MONTHS(TO_DATE(b.indate, 'yyyy-mm'), 1)
--语句完毕
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回复人： zhjzh_zjz(虚心学习，望多指教) ( ) 信誉：117 2003-3-28 15:15:27 得分:0
上面用的是Oracle数据库。由于涉及到双向外连接，所以很长
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回复人： zhongjz(小海螺) ( ) 信誉：105 2003-3-28 15:46:39 得分:5
从数据库中去一年的各单位电话费统计（电话费定额贺电化肥清单两个表来源）
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '01', a.factration)) AS JAN,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '02', a.factration)) AS FRI,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03', a.factration)) AS MAR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04', a.factration)) AS APR,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05', a.factration)) AS MAY,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06', a.factration)) AS JUE,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07', a.factration)) AS JUL,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08', a.factration)) AS AGU,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09', a.factration)) AS SEP,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10', a.factration)) AS OCT,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11', a.factration)) AS NOV,
SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12', a.factration)) AS DEC
FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration
FROM TELFEESTAND a, TELFEE b
WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy')
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回复人： zzlcn() ( ) 信誉：86 2003-3-28 17:24:15 得分:0
请问如果有 10 万 条数据 该怎么查询，我一查询就出错
如果是3万条还可以接受，但是到了3万条以上就不稳定！
我用了 sqlserver 也没有用
10 万条数据来一次分页显示居然要 10-15秒的超长时间！！！！！
如果在分页显示中查询，立即告吹！！！
asp 和 asp.net 我都试用过（＋ ms sqlserver）
均是如此
是不是 asp 和 asp.net 都是垃圾中的垃圾！！！
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-28 17:40:16 得分:0
大量复杂的数据分析,在结构设计上就应该要考虑进去.适当设置一些字段或表存储分段统计信息.
否则再好的数据库都撑不住的..
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回复人： sishuo(思铄) ( ) 信誉：100 2003-3-29 9:39:01 得分:0
好，收了。
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回复人： huijunzi(Cyril) ( ) 信誉：97 2003-3-30 16:49:18 得分:5
有意思,我也来一个，解决跳号的问题：
select min(bh)+1 from Table1 where bh+1 not in(select bh from Table1)
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-3-31 9:50:13 得分:0
进行复杂数据分析还有一种趋势那就是使用数据仓库(Data Houseware)和OLAP.
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回复人： bkss(白开水水) ( ) 信誉：100 2003-4-1 11:09:20 得分:0
哈哈，我也来凑热闹。。。
DECLARE @QuitMedNo char(13)
DECLARE @PreRecipeNo char(13),@PreRecipeXNo char(3)
Declare @zyxh char(12),@kdks char(8)
DECLARE @DepotName char(10)
BEGIN TRAN
if not exists(select 摆药单号 from 摆药单 where 状态='00' and 摆药单号=@PutMedNo)
begin
return 0
end
EXECUTE Sp_GetBillNo @QuitMedNo output,'D'
INSERT INTO [退药]([退药序号], [操作员], [退药时间], [退药说明])
VALUES(@QuitMedNo,@Operator,cast(getdate() as smalldatetime),@Intro)
if (@@error<>0 or @@rowcount=0)
begin
rollback transaction
raiserror('插入退药表失败',16,-1)
return 1
end
DECLARE PutMed_Cursor CURSOR FOR
SELECT DISTINCT A.处方号,A.处方序号,B.住院序号,B.科室,C.名称 as 摆药区 FROM 摆药单明细 A inner join 处方 B ON A.处方号 =B.处方号 AND A.处方序号=B.处方序号
INNER JOIN 摆药区 C ON B.摆药区=C.代码 WHERE A.摆药单号=@PutMedNo
OPEN PutMed_Cursor
FETCH NEXT FROM PutMed_Cursor INTO @PreRecipeNo, @PreRecipeXNo,@zyxh,@kdks,@DepotName
WHILE @@FETCH_STATUS = 0
BEGIN
EXEC usp_QuitBillDetail @QuitMedNo ,@PutMedNo,@PreRecipeNo,@PreRecipeXNo,@zyxh,@kdks,@fsks,@DepotName
--另一个存储过程
if (@@error<>0)
begin
rollback transaction
CLOSE PutMed_Cursor
--DEALLOCATE PutMed_Cursor
raiserror('更新退单处方明细失败',16,-1)
return 1
end
FETCH NEXT FROM PutMed_Cursor INTO @PreRecipeNo, @PreRecipeXNo,@zyxh,@kdks
END
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回复人： bkss(白开水水) ( ) 信誉：100 2003-4-1 11:21:36 得分:10
个人认为，偶写了这么久的SQL，只说语法很无聊，语句的涵义与灵活的组合很重要，下面这个是写的一个药品管理的存储过程的一句，很经典：
UPDATE 药房库存 SET 库存数量=库存数量-B.用量 FROM [药房库存] A ,
( Select sum(用量) as 用量,药品价码 FROM 处方项
WHERE 处方号=@RecipeNo AND 处方序号=@RecipeXNo
GROUP BY 药品价码
) B WHERE A.药品价码=B.药品价码 AND A.库房名称=@DepotName
这是一个参照B表将A表中库存一一修改，而B表中存在一个求和，A表也与B表关联，同时要满足A表条件。
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-1 11:26:50 得分:0
是的..SQL中应用的经典应该只考虑SQL查询的应用..
存储过程已经使用控制语法操作了,和别的程序设计语言设计算法没什么区别..
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回复人： yexiao(叶开) ( ) 信誉：100 2003-4-1 14:11:35 得分:0
gz
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回复人： rong451(rong451) ( ) 信誉：100 2003-4-1 15:43:10 得分:0
very good 我一定收藏！！！
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回复人： gengwei80(gengwei) ( ) 信誉：99 2003-4-2 9:40:27 得分:0
create or replace procedure p_table
(
p_g3e_fno g3e_features_optable.g3e_fno%type
)
as
v_xlmc VARCHAR2(12);
v_XLDM VARCHAR2(5);
cursor c_table IS
select g3e_table from g3e_component where g3e_cno=(select g3e_primaryattributecno
from g3e_features_optable where g3e_fno=p_g3e_fno);
type t_sor is ref cursor;
v_sor t_sor;
str varchar2(50);
begin
for v_table in c_table loop
str:='select xlmc,xldm from '||v_table.g3e_table;
dbms_output.put_line(v_table.g3e_table);
open v_sor for str;
loop
fetch v_sor into v_xlmc,v_xldm;
dbms_output.put_line('hello g3e_table');
dbms_output.put_line(v_xlmc||' '||v_xldm);
exit when v_sor%notfound;
end loop;
close v_sor;
end loop;
end p_table;
个人主页 | 引用 | 返回
回复:[分享]SQl语句学习专题
晴天发表评论于2004-10-26 11:18:00
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回复人： bloodsha(huangxi) ( ) 信誉：98 2003-4-3 8:58:06 得分:0
学
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回复人： csdntoll(低调惯了) ( ) 信誉：147 2003-4-3 11:40:16 得分:0
回复人： csdntoll(toll) ( ) 信誉：100 2003-3-21 10:02:00 得分:0
我决定：把200分中的180分，奖给贴出最精妙的SQL的高手！
-------------------------------------------------------------------
想揭贴，可是为难了：
我要遵守自己说过的话（如上），可我菜，鉴别能力有限，怎么办？
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回复人： wilsonGao(笑傲江湖) ( ) 信誉：101 2003-4-3 13:29:11 得分:0
如何用一句语句实现两个表的关键字倒换？
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回复人： pyz8000(黑洞) ( ) 信誉：101 2003-4-3 18:48:04 得分:0
晕倒，，，收藏～～
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回复人： chinahuman(枯) ( ) 信誉：105 2003-4-3 18:50:07 得分:0
有没有办法一条语句实现以下功能：比如一个新闻系统里有很多个管理员，在添加过程中每条都记录管理员的ID，现想根据用户ID来实现统计它们添加的条数？
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-3 19:29:42 得分:0
to chinahuman(枯)
一个group by和一个聚合函数(count)就可以了..
select count(Title) from news group by creade_by
如果需要得到除非聚合字段外的详细信息那么就得使用相关子查询了..
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回复人： ld_key(什么名字也想) ( ) 信誉：100 2003-4-4 9:59:55 得分:0
markable
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回复人： superdullwolf(超级大笨狼) ( ) 信誉：99 2003-4-4 22:04:45 得分:0
看我的，四表联查问题：
select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
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回复人： superdullwolf(超级大笨狼) ( ) 信誉：99 2003-4-4 22:11:39 得分:10
应聘做了一个小程序,在多人中表现最好,高兴,散分100!!是关于sql查询显示的
题目大概是SQL 表1：班级/老师 表2学生/班级 表三数学/学生 表4语文/学生
查询显示结果大概是这样：
班级1 老师1
学生1 数学 语文
学生2 数学 语文
班级2 老师1
学生1 数学 语文
学生2 数学 语文
不及格：
学生1 班级1 老师1 数学 语文
学生1 班级1 老师1 数学 语文
还有录入学生和成绩的界面
用到了多表之间的inner join on 语句，而且我显示的很漂亮，靠，做了一下午，我好想抽烟啊，当时：）
看我的，四表联查问题：
select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
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回复人： yonghengdizhen(刹那←→永恒) ( ) 信誉：112 2003-4-7 9:43:55 得分:0
左连接右连接内连接全部上马,的确经典哦.
据说你写过上万行代码,大概这就是最经典的一段代码了吧.
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回复人： zady(森林木) ( ) 信誉：100 2003-4-7 14:56:01 得分:5
需求：
得到表中最小的未使用的ID号。
例：
table Name:Handle
HandleID
--------
1
2
5
6
7
--5 Records
执行结果须为3
解决：
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as HandleID
FROM Handle
WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a)
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回复人： Iamfish(呆鱼) ( ) 信誉：105 2003-4-8 13:36:00 得分:80
两台SQL服务器上的一个数据表同步!
drop procedure dbSync
GO
/* 数据同步 */
CREATE PROCEDURE dbSync
@sTabelName varchar(255), --要同步的表名
@sKeyField varchar(255), --关键字段
@sServer varchar(255), --服务器名称或IP
@sUserName varchar(255), --登录到服务器的用户名，一般为sa
@sPassWord varchar(32) --用户登录到服务器的密码
AS
/*删除临时表*/
if exists (select * from dbo.sysobjects where id = object_id(N'tempTbl') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table tempTbl
declare @sql VARCHAR(2000)
/*把表@sTabelName[远程]的数据拷贝到临时表*/
set @sql='select * into tempTbl from '
set @sql=@sql + ' OPENDATASOURCE( '
set @sql=@sql + '''SQLOLEDB.1'','
set @sql=@sql + '''Persist Security Info=True;User ID=' + @sUserName
set @sql=@sql + ';Password=' + @sPassWord
set @sql=@sql + ';Initial Catalog=toys;Data Source=' + @sServer
set @sql=@sql + ''').toys.dbo.'+@sTabelName
EXEC(@sql)
/* 把@sTabelName[本地]中的@sTabelName[远程]表中没有的数据插入到临时表中*/
set @sql='insert into tempTbl select * from '+@sTabelName+' where ['+@sKeyField+'] not in (select ['+@sKeyField+'] from tempTbl)'
EXEC(@sql)
/*清空表@sTabelName[本地]*/
set @sql='truncate table '+@sTabelName
EXEC(@sql)
--取得列名
declare @MySql VARCHAR(2000)
set @MySql=''
declare @title varchar(20)
DECLARE titles_cursor CURSOR FOR
SELECT name from syscolumns where id=object_id(@sTabelName)
OPEN titles_cursor
FETCH NEXT FROM titles_cursor INTO @title
WHILE @@FETCH_STATUS = 0
BEGIN
if @title<>'id'
begin
if @MySql = ''
set @MySql = @MySql + @title
else
set @MySql = @MySql + ',' + @title
end
FETCH NEXT FROM titles_cursor INTO @title
END
CLOSE titles_cursor
DEALLOCATE titles_cursor
--取列名结束
/*把临时表的内容插入到表@sTabelName[本地]*/
set @sql='insert into '+@sTabelName+' select '+@MySql+' from tempTbl'
EXEC(@sql)
/*删除临时表*/
if exists (select * from dbo.sysobjects where id = object_id(N'tempTbl') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table tempTbl
GO
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回复人： lizongqi(英雄啊) ( ) 信誉：100 2003-4-8 15:02:07 得分:0
收藏ing..
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回复人： Swanzy(志远) ( ) 信誉：100 2003-4-8 18:06:08 得分:0
收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏收藏
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回复人： zhyx21century(zhyx) ( ) 信誉：100 2003-4-9 11:19:17 得分:0
UP
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回复人： kingkout(kingkout) ( ) 信誉：100 2003-4-9 14:05:22 得分:0
GZ
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回复人： xxl0914(microlin) ( ) 信誉：105 2003-4-9 14:23:49 得分:0
用sql语句对不同的几张表做笛卡尔积
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回复人： lizongqi(英雄啊) ( ) 信誉：100 2003-4-10 10:44:56 得分:0
收藏ing....
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回复人： xieyj(快乐天使) ( ) 信誉：103 2003-4-11 8:36:16 得分:5
查找一个已知字段所在的表名：
Select Name From Sysobjects Where Id in (select id from syscolumns where name='字段名')
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回复人： leeeel(三角比三星差？) ( ) 信誉：100 2003-4-11 8:55:15 得分:0
强列地反对多个 Select 套在一个语句中使用 ！
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回复人： zhaoming1112(随风往事) ( ) 信誉：100 2003-4-11 11:44:58 得分:0
SELECT套在一起，好用，我不反对。
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回复人： csdnshao(如水人生) ( ) 信誉：105 2003-4-11 11:50:17 得分:0
mark
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回复人： cuoban(搓板) ( ) 信誉：100 2003-4-11 14:57:58 得分:5
前些日子刚写的
说明：进行判断，得出两种应纳税额。
SELECT 姓名, BM AS 部门, SF1 AS 实发, SFZH AS 身份证, Jjje AS 奖金, SF1 + Jjje - 860 AS 应纳所得, XL AS 学历, NTG AS 性别, GWW AS 职务, round((CASE WHEN (SF1 + Jjje - 860 < 500) THEN (SF1 + Jjje - 860) * 0.05 ELSE CASE WHEN (SF1 + Jjje - 860 > 500) THEN (SF1 + GJJ - 860) * 0.10 - 25 END END), 2) AS 应纳税额 FROM GZ20029 WHERE (sf1 + Jjje) > 860
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回复人： lanyd(山雨欲来风满楼) ( ) 信誉：100 2003-4-11 16:13:44 得分:0
强！
看完这些，我也成sql专家了，哈哈
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回复人： 750906(750906) ( ) 信誉：105 2003-4-11 16:29:33 得分:0
SELECT A.*, B.ColumnString AS ColumnString,
(SELECT COUNT(StatuteId)
FROM StatuteLib_Body
WHERE ColumnId IN
(SELECT ColumnId
FROM StatuteLib_ColumnString
WHERE ColumnString LIKE B.ColumnString + '%')) AS StatuteCount
FROM cw25109.StatuteLib_Column A INNER JOIN
cw25109.StatuteLib_ColumnString B ON A.ColumnId = B.ColumnId
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回复人： Swanzy(志远) ( ) 信誉：100 2003-4-12 11:04:11 得分:0
如何查询表中为空值的所有字段内容？
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回复人： xdk(冼德锟) ( ) 信誉：97 2003-4-12 11:37:01 得分:0
好...我是来抢分加收藏的...
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回复人： yu_shi_bin(清风) ( ) 信誉：100 2003-4-14 13:13:18 得分:0
mark
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回复人： sohi(阿梓) ( ) 信誉：100 2003-4-15 8:20:17 得分:0
good
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回复人： laker_tmj(laker) ( ) 信誉：100 2003-4-15 12:22:45 得分:0
up
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回复人： cboy2003(三碗（cpubook.com)) ( ) 信誉：100 2003-4-15 12:26:13 得分:0
不错
全部收了，我把常用的，最最普通的贴出来大家看看吧，我是对上面的某些半知，对自己贴的
还能用用，哈哈
SQL常用命令使用方法：
(1) 数据记录筛选：
sql="select * from 数据表 where 字段名=字段值 order by 字段名 [desc]"
sql="select * from 数据表 where 字段名 like '%字段值%' order by 字段名 [desc]"
sql="select top 10 * from 数据表 where 字段名 order by 字段名 [desc]"
sql="select * from 数据表 where 字段名 in ('值1','值2','值3')"
sql="select * from 数据表 where 字段名 between 值1 and 值2"
(2) 更新数据记录：
sql="update 数据表 set 字段名=字段值 where 条件表达式"
sql="update 数据表 set 字段1=值1,字段2=值2 …… 字段n=值n where 条件表达式"
(3) 删除数据记录：
sql="delete from 数据表 where 条件表达式"
sql="delete from 数据表" (将数据表所有记录删除)
(4) 添加数据记录：
sql="insert into 数据表 (字段1,字段2,字段3 …) valuess (值1,值2,值3 …)"
sql="insert into 目标数据表 select * from 源数据表" (把源数据表的记录添加到目标数据表)
(5) 数据记录统计函数：
AVG(字段名) 得出一个表格栏平均值
COUNT(*|字段名) 对数据行数的统计或对某一栏有值的数据行数统计
MAX(字段名) 取得一个表格栏最大的值
MIN(字段名) 取得一个表格栏最小的值
SUM(字段名) 把数据栏的值相加
引用以上函数的方法：
sql="select sum(字段名) as 别名 from 数据表 where 条件表达式"
set rs=conn.excute(sql)
用 rs("别名") 获取统的计值，其它函数运用同上。
(5) 数据表的建立和删除：
CREATE TABLE 数据表名称(字段1 类型1(长度),字段2 类型2(长度) …… )
例：CREATE TABLE tab01(name varchar(50),datetime default now())
DROP TABLE 数据表名称 (永久性删除一个数据表)
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回复人： zigzag81814() ( ) 信誉：100 2003-4-15 13:09:38 得分:0
好
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回复人： skyswan(施望) ( ) 信誉：100 2003-4-15 13:33:36 得分:0
怎么都是用在Sql Server上的。
有好多是不能用在Oracle的PL/SQL上的
SQL语法参考手册
2001年3月22日
DB2 提供了关连式资料库的查询语言 ＳＱＬ (Structured Query Language)，是一种非常口语化、既易学又易懂的语法。此一语言几乎是每个资料库系统都必须提供的，用以表示关连式的操作，包含了资料的定义（ＤＤＬ）以及资料的处理（ＤＭＬ）。SQL原来拼成SEQUEL，这语言的原型以"系统 R"的名字在 IBM 圣荷西实验室完成，经过IBM内部及其他的许多使用性及效率测试，其结果相当令人满意，并决定在系统R 的技术基础发展出来 IBM 的产品。而且美国国家标准学会（ANSI）及国际标准化组织（ISO）在1987遵循一个几乎是以 IBM SQL 为基础的标准关连式资料语言定义。
一、资料定义 ＤＤＬ（Data Definition Language)
资料定语言是指对资料的格式和形态下定义的语言，他是每个资料库要建立时候时首先要面对的，举凡资料分哪些表格关系、表格内的有什麽栏位主键、表格和表格之间互相参考的关系等等，都是在开始的时候所必须规划好的。
１、建表格：
CREATE TABLE table_name(
column1 DATATYPE [NOT NULL] [NOT NULL PRIMARY KEY],
column2 DATATYPE [NOT NULL],
...）
说明：
DATATYPE --是资料的格式，详见表。
NUT NULL --可不可以允许资料有空的（尚未有资料填入）。
PRIMARY KEY --是本表的主键。
２、更改表格
ALTER TABLE table_name
ADD COLUMN column_name DATATYPE
说明：增加一个栏位（没有删除某个栏位的语法。
ALTER TABLE table_name
ADD PRIMARY KEY (column_name)
说明：更改表得的定义把某个栏位设为主键。
ALTER TABLE table_name
DROP PRIMARY KEY (column_name)
说明：把主键的定义删除。
３、建立索引
CREATE INDEX index_name ON table_name (column_name)
说明：对某个表格的栏位建立索引以增加查询时的速度。
４、删除
DROP table_name
DROP index_name
二、的资料形态 DATATYPEs
smallint
16 位元的整数。
interger
32 位元的整数。
decimal(p,s)
p 精确值和 s 大小的十进位整数，精确值p是指全部有几个数(digits)大小值，s是指小数
点後有几位数。如果没有特别指定，则系统会设为 p=5; s=0 。
float
32位元的实数。
double
64位元的实数。
char(n)
n 长度的字串，n不能超过 254。
varchar(n)
长度不固定且其最大长度为 n 的字串，n不能超过 4000。
graphic(n)
和 char(n) 一样，不过其单位是两个字元 double-bytes， n不能超过127。这个形态是为
了支援两个字元长度的字体，例如中文字。
vargraphic(n)
可变长度且其最大长度为 n 的双字元字串，n不能超过 2000。
date
包含了 年份、月份、日期。
time
包含了 小时、分钟、秒。
timestamp
包含了 年、月、日、时、分、秒、千分之一秒。
三、资料操作 ＤＭＬ （Data Manipulation Language)
资料定义好之後接下来的就是资料的操作。资料的操作不外乎增加资料（insert)、查询资料（query）、更改资料（update) 、删除资料（delete）四种模式，以下分 别介绍他们的语法：
１、增加资料：
INSERT INTO table_name (column1,column2,...)
VALUES ( value1,value2, ...)
说明：
1.若没有指定column 系统则会按表格内的栏位顺序填入资料。
2.栏位的资料形态和所填入的资料必须吻合。
3.table_name 也可以是景观 view_name。
INSERT INTO table_name (column1,column2,...)
SELECT columnx,columny,... FROM another_table
说明：也可以经过一个子查询（subquery）把别的表格的资料填入。
２、查询资料：
基本查询
SELECT column1,columns2,...
FROM table_name
说明：把table_name 的特定栏位资料全部列出来
SELECT *
FROM table_name
WHERE column1 = xxx
[AND column2 > yyy] [OR column3 <> zzz]
说明：
1.'*'表示全部的栏位都列出来。
2.WHERE 之後是接条件式，把符合条件的资料列出来。
SELECT column1,column2
FROM table_name
ORDER BY column2 [DESC]
说明：ORDER BY 是指定以某个栏位做排序，[DESC]是指从大到小排列，若没有指明，则是从小到大
排列
组合查询
组合查询是指所查询得资料来源并不只有单一的表格，而是联合一个以上的
表格才能够得到结果的。
SELECT *
FROM table1,table2
WHERE table1.colum1=table2.column1
说明：
1.查询两个表格中其中 column1 值相同的资料。
2.当然两个表格相互比较的栏位，其资料形态必须相同。
3.一个复杂的查询其动用到的表格可能会很多个。
整合性的查询：
SELECT COUNT (*)
FROM table_name
WHERE column_name = xxx
说明：
查询符合条件的资料共有几笔。
SELECT SUM(column1)
FROM table_name
说明：
1.计算出总和，所选的栏位必须是可数的数字形态。
2.除此以外还有 AVG() 是计算平均、MAX()、MIN()计算最大最小值的整合性查询。
SELECT column1,AVG(column2)
FROM table_name
GROUP BY column1
HAVING AVG(column2) > xxx
说明：
1.GROUP BY: 以column1 为一组计算 column2 的平均值必须和 AVG、SUM等整合性查询的关键字
一起使用。
2.HAVING : 必须和 GROUP BY 一起使用作为整合性的限制。
复合性的查询
SELECT *
FROM table_name1
WHERE EXISTS (
SELECT *
FROM table_name2
WHERE conditions )
说明：
1.WHERE 的 conditions 可以是另外一个的 query。
2.EXISTS 在此是指存在与否。
SELECT *
FROM table_name1
WHERE column1 IN (
SELECT column1
FROM table_name2
WHERE conditions )
说明：
1. IN 後面接的是一个集合，表示column1 存在集合里面。
2. SELECT 出来的资料形态必须符合 column1。
其他查询
SELECT *
FROM table_name1
WHERE column1 LIKE 'x%'
说明：LIKE 必须和後面的'x%' 相呼应表示以 x为开头的字串。
SELECT *
FROM table_name1
WHERE column1 IN ('xxx','yyy',..)
说明：IN 後面接的是一个集合，表示column1 存在集合里面。
SELECT *
FROM table_name1
WHERE column1 BETWEEN xx AND yy
说明：BETWEEN 表示 column1 的值介於 xx 和 yy 之间。
３、更改资料：
UPDATE table_name
SET column1='xxx'
WHERE conditoins
说明：
1.更改某个栏位设定其值为'xxx'。
2.conditions 是所要符合的条件、若没有 WHERE 则整个 table 的那个栏位都会全部被更改。
４、删除资料：
DELETE FROM table_name
WHERE conditions
说明：删除符合条件的资料。
说明：关于WHERE条件后面如果包含有日期的比较，不同数据库有不同的表达式。具体如下：
(1)如果是ACCESS数据库，则为：WHERE mydate>#2000-01-01#
(2)如果是ORACLE数据库，则为：WHERE mydate>cast('2000-01-01' as date)
或：WHERE mydate>to_date('2000-01-01','yyyy-mm-dd')
在Delphi中写成：
thedate='2000-01-01';
query1.SQL.add('select * from abc where mydate>cast('+''''+thedate+''''+' as date)');
如果比较日期时间型，则为：
WHERE mydatetime>to_date('2000-01-01 10:00:01','yyyy-mm-dd hh24:mi:ss')
