3月17日 45道T-SQL查找习题

创建学生表
create table Student
(
Sno varchar(20) not null primary key,
Sname varchar(20) not null,
Ssex varchar(20) not null,
Sbirthday datetime,
Class varchar(20)
)

创建教师表
create table Teacher
(
Tno varchar(20) not null primary key,
Tname varchar(20) not null,
Tsex varchar(20) not null,
Tbirthday datetime,
Prof varchar(20),
Depart varchar(20) not null
)

创建课程表
create table Course
(
Cno varchar(20) not null primary key,
Cname varchar(20) not null,
Tno varchar(20) not null,
foreign key(Tno) references Teacher(Tno)
)

创建成绩表
create table Score
(
Sno varchar(20) not null,
foreign key (Sno) references Student(Sno),
Cno varchar(20) not null,
foreign key (Cno) references Course (Cno),
Degree Decimal(4,1),
primary key(Sno,Cno)
)

录入Student 信息
insert into Student values('108','曾华','男','1977-09-01','95033')

insert into Student values('105','匡明','男','1975-10-02','95031')

insert into Student values('107','王丽','女','1976-01-23','95033')

insert into Student values('101','李军','男','1976-02-20','95033')

insert into Student values('109','王芳','女','1975-02-10','95031')

insert into Student values('103','陆君','男','1974-06-03','95031')

录入Teacher 信息

insert into Teacher values('804','李诚','男','1958-12-02','副教授','计算机系');

insert into Teacher values('856','张旭','男','1969-03-12','讲师','电子工程系');

insert into Teacher values('825','王萍','女','1972-05-05','助教','计算机系');

insert into Teacher values('831','李冰','女','1977-08-14','助教','电子工程系');

录入Course 信息

insert into Course values('3-105','计算机导论','825');

insert into Course values('3-245','操作系统','804');

insert into Course values('6-166','数字电路','856');

insert into Course values('9-888','高等数学','831');

录入Score 信息

insert into Score values('103','3-245','86');

insert into Score values('105','3-245','75');

insert into Score values('109','3-245','68');

insert into Score values('103','3-105','92');

insert into Score values('105','3-105','88');

insert into Score values('109','3-105','76');

insert into Score values('101','3-105','64');

insert into Score values('107','3-105','91');

insert into Score values('108','3-105','78');

insert into Score values('101','6-166','85');

insert into Score values('107','6-166','79');

insert into Score values('108','6-166','81');

1、查询Student表中的所有记录的Sname、Ssex和Class列。

select Sname , Ssex , Class from Student

2、查询教师所有的单位即不重复的Depart列。

select distinct Depart from Teacher

3、查询Student表的所有记录。

select * from Student

4、查询Score表中成绩在60到80之间的所有记录。

select * from Score where Degree >60 and Degree < 80

select * from Score where Degree >= 60 and Degree <=80

select * from Score where Degree between 60 and 80

5、查询Score表中成绩为85，86或88的记录。

select * from Score where Degree = 85 or Degree = 86 or Degree = 88

select * from Score where Degree in (85 , 86 , 88)

6、查询Student表中“95031”班或性别为“女”的同学记录。

select * from Student where Class = '95031' or Ssex = '女'

7、以Class降序查询Student表的所有记录。

select * from Student order by Class desc

8、以Cno升序、Degree降序查询Score表的所有记录。

select * from Score order by Cno asc , Degree desc

select * from Score order by Cno , Degree desc

9、查询“95031”班的学生人数。

select count(class) from Student where class = '95031'

select count(*) from Student where Class = '95031'

10、查询Score表中的最高分的学生学号和课程号。（子查询或者排序）

select Sno , Cno from Score where Degree = (select max(Degree) from Score)

11、查询每门课的平均成绩。

select avg(Degree) from Score group by Cno

select Cno,avg(Degree) from Score group by Cno

12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。

select avg(Degree) from Score group by Cno having count(*)>5 and Cno like '3%'

select avg(Degree) from Score where Cno in (select * from Score group by Cno having count(*) > 5) and Cno like '3%' group by Cno

select avg(Degree) from Score where Cno like '3%' group by Cno having count(*) > 5

13、查询分数大于70，小于90的Sno列。

select Sno from Score where Degree > 70 and Degree < 90

select Sno from Score where Degree between 70 and 90

14、查询所有学生的Sname、Cno和Degree列。

select Student.Sname , Score.Cno , Score.Degree from Student , Score where Student.Sno = Score.Sno

select Sname , Cno , Degree from Score join Student on Student.Sno = Score.Sno

15、查询所有学生的Sno、Cname和Degree列。

select Student.Sno , Course.Cname , Score.Degree from Student , Course , Score where Student.Sno = Score.sno and Course.Cno = Score.Cno

select Sno , Cname , Degree from Score join Course on Score.Cno = Course.Cno

16、查询所有学生的Sname、Cname和Degree列。

select Student.Sname , Course.Cname , Score.Degree from Student , Course , Score where Student.Sno = Score.sno and Course.Cno = Score.Cno

select Sname , Cname ,Degree from Score join Student on Student.Sno = Score.Sno join Course on Score.Cno = Course.Cno

17、查询“95033”班学生的平均分。

select Cno,avg(Degree) from Student,Score where Student.Class = '95033' group by Cno

select avg(Degree) from Score where Sno in (select Sno from Student where Class = '95033')

18、假设使用如下命令建立了一个grade表：

creat table grade (low int(3) , upp int(3), rank char(1))

insert into grade values(90,100,'A');

insert into grade values(80,89,'B');

insert into grade values(70,79,'C');

insert into grade values(60,69,'D');

insert into grade values(0,59,'E');

现查询所有同学的Sno、Cno和rank列。

select Student.Sno , Score.Cno , grade.rank from Student , Score , grade where Score.Sno = Student.Sno

select Sno , Cno , rank from Score join grade on Score.Degree between low and upp

19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。

select * from Student where Sno in (select Sno from Score where Cno = '3-105' and Degree >(select Degree from Score where Sno = '109' and Cno = '3-105') )

select * from Scroe where Cno = '3-105' ande Degree >(select Degree from Score where Sno = '109' and Cno = '3-105')

20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。

select * from Score a where Sno in (select Sno from Score group by Sno having count(*) > 1) and Degree not in (select max(Degree) from Score b where b.Cno = a.Cno)

21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。

select * from Student where Sno in (select Sno from Score where Cno = '3-105' and Degree >(select Degree from Score where Sno = '109' and Cno = '3-105') )

select * from Score where Degree > (select * from Score where Sno = '109' and Cno = '3-105')

22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。

select Sno , Sname , Sbirthday from Student where year(Sbirthday) = (select year(Sbirthday) from Student where Sno = '108')

select Sno , Sname , Sbirthday from Student where YEAR(SBirthday) = (select YEAR(SBirthday) from Student where Sno = '108')

23、查询“张旭“教师任课的学生成绩。

select Degree from Score where Cno = (select Cno from Course where Tno = (select Tno from Teacher where Tname = '张旭'))

select Degree from Score where Cno in (select Cno from Course where Tno = (select * from Teacher where Tname = '张旭'))

24、查询选修某课程的同学人数多于5人的教师姓名。

select Tname from Teacher where Tno = (select Tno from Course where Cno = (select Cno from Score group by Cno having count(*)>5))

select Tname from Teacher where Tno in(select Tno from Course where Cno in (select Cno from Score group by Cno having count(*) >5))

25、查询95033班和95031班全体学生的记录。

select * from Student where class = '95033' or class = '95031'

select * from Student where Class in ( '95033' , '95031')

26、查询存在有85分以上成绩的课程Cno.

select Cno from Score where Degree > 85

select distinct Cno from Score where Degree > 85

27、查询出“计算机系“教师所教课程的成绩表。

select Degree from Score where Cno in (select Cno from Course where Tno in (select Tno from Teacher where Depart = '计算机系'))

28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。

select Tname , Prof from Teacher where

select Tname , prof from Teacher where prof not in (select prof from Teacher where depart = '计算机系' and prof in (select prof from Teacher where depart = '电子工程系'))

29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。

select Cno , Sno ,Degree from Score where Cno = '3-105' and Degree > (select min(Degree) from Score where Cno = '3-245') order by Degree desc

select * from Score where Cno = '3-105' and Degree >any(select Degree from Score where Cno = '3-245') order by Degree desc // any 列表中的任意一个

30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.

select Cno , Sno , Degree from Score where Cno = '3-105' and Degree > (select max(Degree) from Score where Cno = '3-245')

select * from Score where Cno = '3-105' and Degree >all(select Degree from Score where Cno = '3-245') //all 列表中的所有

31、查询所有教师和同学的name、sex和birthday.

select Tname , Tsex , Tbirthday from Teacher

union

select Sname , Ssex , Sbirthday from Student

union

select Tname , Tsex , Tbirthday from Teacher

32、查询所有“女”教师和“女”同学的name、sex和birthday.

select Tname , Tsex , Tbirthday from Teacher where Tsex = '女'

union

select Sname , Ssex , Sbirthday from Student where Ssex = '女'

union

select Tname , Tsex , Tbirthday from Teacher where Tsex = '女'

33、查询成绩比该课程平均成绩低的同学的成绩表。

select Degree from Score a where Degree < (select avg(Degree) from Score b where b.Cno = a.Cno)

select * from Score a where Degree < (select avg(Degree) from Score b where b.Cno = a.Cno )

34、查询所有任课教师的Tname和Depart.

select Tname , Depart from Teacher where Tno in (select Tno from Course)

select Tname , depart from Teacher where Tno in (select Tno from Course where Cno in (select Cno from Score))

35 、查询所有未讲课的教师的Tname和Depart.

select Tname , Depart from Teacher where Tno not in (select Tno from Course)

select Tname , depart from Teacher where Tno in (select Tno from Course where Cno not in (select Cno from Score))

36、查询至少有2名男生的班号。

select Class from Student group by class having count(Ssex = '男') >2

select Class from Student where Ssex = '男' group by Class having count(*) > 1

37、查询Student表中不姓“王”的同学记录。

select * from Student where Sname not like '王%'

select * from Student wher Sno not in (select Sno from Student weher Sname like '王%')

38、查询Student表中每个学生的姓名和年龄。

select DATEDIFF(yy,Sbirthday,2016-2-16)from Student

select Sname,YEAR(now())-YEAR(Sbirthday) from Student

39、查询Student表中最大和最小的Sbirthday日期值。

select max(Sbirthday) , min(Sbirthday) from Student

select max(Sbirthday) from Student union
select min(Sbirthday) from Student

40、以班号和年龄从大到小的顺序查询Student表中的全部记录。

select * from Student order by class desc, Sbirthday desc

select * from Student order by Class desc , Sbirthday

41、查询“男”教师及其所上的课程。

select Teacher.* , Course.Cname from Teacher , Course where Tsex = '男' and Teacher.Tno = Course.Tno

select * from Teacher join Course on Teacher.Tno = Course.Tno where Teacher.Tsex = '男'

42、查询最高分同学的Sno、Cno和Degree列。

select Sno , Cno , Degree from Score where Degree = (select max(Degree) from Score)

select * from Score where Degree = (select max(Degree) from Score )

43、查询和“李军”同性别的所有同学的Sname.

select Sname from Student where Ssex = (select Ssex from Student where Sname = '李军')

44、查询和“李军”同性别并同班的同学Sname.

select Sname from Student where Ssex = (select Ssex from Student where Sname = '李军') and class = (select class from Student where Sname = '李军')

select Sname from Student where Ssex = (select Ssex from Student where Sname = '李军') and Class = (select Class from Student where Sname = '李军')

45、查询所有选修“计算机导论”课程的“男”同学的成绩表。

select Degree from Score where Cno in (select Cno from Course where Cname = '计算机导论') and Sno in (select Sno from Student where Ssex = '男')

select * from Score where Sno in(select Sno from Student where Ssex = '男') and Cno in(select Cno from Course where Cname = '计算机导论')

posted on 2016-03-17 14:16 一方通行o 阅读(133) 评论(0) 编辑收藏举报

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