學生成績表(stuscore)：

姓名：name ??? 課程：subject ??? 分數：score ??? 學號：stuid

張三 ??? 數學 ??? 89 ??? 1

張三 ??? 語文 ??? 80 ??? 1

張三 ??? 英語 ??? 70 ??? 1

李四 ??? 數學 ??? 90 ??? 2

李四 ??? 語文 ??? 70 ??? 2

李四 ??? 英語 ??? 80 ??? 2

1.計算每個人的總成績并排名(要求顯示字段：姓名，總成績)

答案：select name,sum(score) as allscore from stuscore group by name order by allscore

2.計算每個人的總成績并排名(要求顯示字段: 學號，姓名，總成績)

答案：select distinct t1.name,t1.stuid,t2.allscore from? stuscore t1,(??? select stuid,sum(score) as allscore from stuscore group by stuid)t2where t1.stuid=t2.stuidorder by t2.allscore desc

3.計算每個人單科的最高成績(要求顯示字段: 學號，姓名，課程，最高成績)

答案：select t1.stuid,t1.name,t1.subject,t1.score from stuscore t1,(select stuid,max(score) as maxscore from stuscore group by stuid) t2where t1.stuid=t2.stuid and t1.score=t2.maxscore

4.計算每個人的平均成績(要求顯示字段: 學號，姓名，平均成績)

答案：select distinct t1.stuid,t1.name,t2.avgscore from stuscore t1,(select stuid,avg(score) as avgscore from stuscore group by stuid) t2where t1.stuid=t2.stuid

5.列出各門課程成績最好的學生(要求顯示字段: 學號，姓名,科目，成績)

答案：select? t1.stuid,t1.name,t1.subject,t2.maxscore from stuscore t1,(select subject,max(score) as maxscore from stuscore group by subject) t2where t1.subject=t2.subject and t1.score=t2.maxscore

6.列出各門課程成績最好的兩位學生(要求顯示字段: 學號，姓名,科目，成績)

答案：select distinct t1.* from stuscore t1 where t1.id in (select top 2 stuscore.id from stuscore where subject = t1.subject order by score desc) order by t1.subject

7.統計如下：學號 ??? 姓名 ??? 語文 ??? 數學 ??? 英語 ??? 總分 ??? 平均分

答案：select stuid as 學號,name as 姓名,sum(case when subject=’語文’ then score else 0 end) as 語文,sum(case when subject=’數學’ then score else 0 end) as 數學,sum(case when subject=’英語’ then score else 0 end) as 英語,sum(score) as 總分,(sum(score)/count(*)) as 平均分from stuscoregroup by stuid,name order by 總分desc

8．列出各門課程的平均成績(要求顯示字段：課程，平均成績)

答案：select subject,avg(score) as avgscore from stuscoregroup by subject

9．列出數學成績的排名(要求顯示字段：學號，姓名，成績，排名)

答案：

declare @tmp table(pm int,name varchar(50),score int,stuid int)

insert into @tmp select null,name,score,stuid from stuscore where subject=’數學’ order by score desc

declare @id int

set @id=0;

update @tmp set @id=@id+1,pm=@id

select * from @tmp

oracle:

select? DENSE_RANK () OVER(order by score desc) as row,name,subject,score,stuid from stuscore where subject=’數學’order by score desc

ms sql(最佳選擇)

select (select count(*) from stuscore t1 where subject =’數學’ and t1.score>t2.score)+1 as row ,stuid,name,score from stuscore t2 where subject =’數學’ order by score desc

10．列出數學成績在2-3名的學生(要求顯示字段：學號，姓名,科目，成績)

答案：select t3.*? from(select top 2 t2.*? from (select top 3 name,subject,score,stuid from stuscore where subject=’數學’order by score desc) t2 order by t2.score) t3 order by t3.score desc

11．求出李四的數學成績的排名

答案：

declare @tmp table(pm int,name varchar(50),score int,stuid int)insert into @tmp select null,name,score,stuid from stuscore where subject=’數學’ order by score descdeclare @id intset @id=0;update @tmp set @id=@id+1,pm=@idselect * from @tmp where name=’李四’

12．統計如下：課程 ??? 不及格(0-59)個 ??? 良(60-80)個 ??? 優(81-100)個

答案：select subject, (select count(*) from stuscore where score<60 and subject=t1.subject) as 不及格,(select count(*) from stuscore where score between 60 and 80 and subject=t1.subject) as 良,(select count(*) from stuscore where score >80 and subject=t1.subject) as 優from stuscore t1 group by subject

13．統計如下：數學:張三(50分),李四(90分),王五(90分),趙六(76分)

答案：

declare @s varchar(1000)set @s=”select @s =@s+’,’+name+'(‘+convert(varchar(10),score)+’分)’ from stuscore where subject=’數學’ set @s=stuff(@s,1,1,”)print ‘數學:’+@s

14.計算科科及格的人的平均成績

答案： select distinct t1.stuid,t2.avgscore? from stuscore t1,(select stuid,avg(score) as avgscore from stuscore?? group by stuid? ) t2,(select stuid from stuscore where score<60 group by stuid) t3 where t1.stuid=t2.stuid and t1.stuid!=t3.stuid;

select? name,avg(score) as avgscore?? from stuscore s? where (select sum(case when i.score>=60 then 1 else 0 end) from stuscore i where? i.name= s.name)=3?? group by name

總結

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