|
Posted on
2008-09-27 17:27
王景
阅读( 405)
评论()
编辑
收藏
举报
学生成绩表(stuscore):
姓名:name
|
课程:subject
|
分数:score
|
学号:stuid
|
张三
|
数学
|
89
|
1
|
张三
|
语文
|
80
|
1
|
张三
|
英语
|
70
|
1
|
李四
|
数学
|
90
|
2
|
李四
|
语文
|
70
|
2
|
李四
|
英语
|
80
|
2
|
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif) 创建表 ANSI_NULLS ON
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
GO
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
SET QUOTED_IDENTIFIER ON
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
GO
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
SET ANSI_PADDING ON
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
GO
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
CREATE TABLE [dbo].[stuscore](
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[name] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[subject] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[score] [int] NULL,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[stuid] [int] NULL
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) ON [PRIMARY]
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
GO
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
SET ANSI_PADDING OFF
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
问题:
1. 计算每个人的总成绩并排名(要求显示字段:姓名,总成绩)
2. 计算每个人的总成绩并排名(要求显示字段: 学号,姓名,总成绩)
3. 计算每个人单科的最高成绩(要求显示字段: 学号,姓名,课程,最高成绩)
4. 计算每个人的平均成绩(要求显示字段: 学号,姓名,平均成绩)
5. 列出各门课程成绩最好的学生(要求显示字段: 学号,姓名,科目,成绩)
6. 列出各门课程成绩最好的两位学生(要求显示字段: 学号,姓名,科目,成绩)
7. 统计如下:
8.列出各门课程的平均成绩(要求显示字段:课程,平均成绩)
9.列出数学成绩的排名(要求显示字段:学号,姓名,成绩,排名)
10.列出数学成绩在2-3名的学生(要求显示字段:学号,姓名,科目,成绩)
11.求出李四的数学成绩的排名
12.统计如下:
课程
|
不及格(0-59)个
|
良(60-80)个
|
优(81-100)个
|
|
|
|
|
13.统计如下:数学:张三(50分),李四(90分),王五(90分),赵六(76分)
答案:
1. 计算每个人的总成绩并排名
select name,sum(score) as allscore from stuscore group by name order by allscore
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2. 计算每个人的总成绩并排名
select distinct t1.name,t1.stuid,t2.allscore from stuscore t1,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select stuid,sum(score) as allscore from stuscore group by stuid
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
)t2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
where t1.stuid=t2.stuid
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
order by t2.allscore desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3. 计算每个人单科的最高成绩
select t1.stuid,t1.name,t1.subject,t1.score from stuscore t1,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select stuid,max(score) as maxscore from stuscore group by stuid
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) t2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
where t1.stuid=t2.stuid and t1.score=t2.maxscore
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
4.计算每个人的平均成绩
select distinct t1.stuid,t1.name,t2.avgscore from stuscore t1,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select stuid,avg(score) as avgscore from stuscore group by stuid
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) t2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
where t1.stuid=t2.stuid
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5.列出各门课程成绩最好的学生
select t1.stuid,t1.name,t1.subject,t2.maxscore from stuscore t1,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select subject,max(score) as maxscore from stuscore group by subject
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) t2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
where t1.subject=t2.subject and t1.score=t2.maxscore
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6.列出各门课程成绩最好的两位学生
select distinct t1.* from stuscore t1
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
where t1.stuid in
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(select top 2 stuscore.stuid from stuscore where subject = t1.subject order by score desc)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
order by t1.subject
7.学号 姓名 语文 数学 英语 总分 平均分
select stuid as 学号,name as 姓名,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
sum(case when subject='语文' then score else 0 end) as 语文,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
sum(case when subject='数学' then score else 0 end) as 数学,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
sum(case when subject='英语' then score else 0 end) as 英语,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
sum(score) as 总分,(sum(score)/count(*)) as 平均分
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
from stuscore
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
group by stuid,name
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
order by 总分desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
8.列出各门课程的平均成绩
select subject,avg(score) as avgscore from stuscore
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
group by subject
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
9.列出数学成绩的排名
declare @tmp table(pm int,name varchar(50),score int,stuid int)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
insert into @tmp select null,name,score,stuid from stuscore where subject='数学' order by score desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declare @id int
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
set @id=0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
update @tmp set @id=@id+1,pm=@id
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select * from @tmp
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select DENSE_RANK () OVER(order by score desc) as row,name,subject,score,stuid from stuscore where subject='数学'
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
order by score desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declare @tmp table(pm int identity(1,1),name varchar(50),score int,stuid int)
insert into @tmp
select name,score,stuid from stuscore where subject='数学' order by score desc
select * from @tmp
10. 列出数学成绩在2-3名的学生
select t3.* from
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select top 2 t2.* from (
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select top 3 name,subject,score,stuid from stuscore where subject='数学'
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
order by score desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) t2 order by t2.score
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
) t3 order by t3.score desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
11. 求出李四的数学成绩的排名
declare @tmp table(pm int,name varchar(50),score int,stuid int)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
insert into @tmp select null,name,score,stuid from stuscore where subject='数学' order by score desc
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declare @id int
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
set @id=0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
update @tmp set @id=@id+1,pm=@id
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select * from @tmp where name='李四'
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
12. 课程 不及格(-59) 良(-80) 优(-100)
select subject,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(select count(*) from stuscore where score<60 and subject=t1.subject) as 不及格,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(select count(*) from stuscore where score between 60 and 80 and subject=t1.subject) as 良,
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
(select count(*) from stuscore where score >80 and subject=t1.subject) as 优
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
from stuscore t1 group by subject
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
13. 数学:张三(50分),李四(90分),王五(90分),赵六(76分)
declare @s varchar(1000)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
set @s=''
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
select @s =@s+','+name+'('+convert(varchar(10),score)+'分)' from stuscore where subject='数学'
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
set @s=stuff(@s,1,1,'')
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
print '数学:'+@s
|