SQL SERVER一句Sql把纵向表转为横向表，并分别分组求平均和总平

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代码如下:

 
declare @tab table(Class varchar(20),Student varchar(20),Course varchar(50),Quantity decimal(7,2)); 
insert into @tab(Class,Student,Course,Quantity) values('A班','张三','语文',60); 
insert into @tab(Class,'数学',70); 
insert into @tab(Class,'英语',80); 
insert into @tab(Class,'李四',30); 
insert into @tab(Class,40); 
insert into @tab(Class,50); 

insert into @tab(Class,Quantity) values('B班','王五',65); 
insert into @tab(Class,75); 
insert into @tab(Class,85); 
insert into @tab(Class,'赵六',35); 
insert into @tab(Class,45); 
insert into @tab(Class,55); 



select * from @tab 

select 
(case when Grouping(Class)=1 then '总平均' when Grouping(Student)=1 then '' else Class end ) as Class,(case when Grouping(Class)=1 then '' when Grouping(Student)=1 then '平均' else Student end) as Student,avg(语文) as 语文,avg(数学) as 数学,avg(英语) as 英语,avg(总分) as 总分 
from ( 
select Class,(select isnull(sum(Quantity),0) from @tab where Class=t.Class and Student=t.Student and Course='语文') as '语文',0) from @tab where Class=t.Class and Student=t.Student and Course='数学') as '数学',0) from @tab where Class=t.Class and Student=t.Student and Course='英语') as '英语',0) from @tab where Class=t.Class and Student=t.Student) as '总分' 
from @tab as t 
group by Class,Student 
) as tempTab 
group by Class,语文,数学,英语,总分 with rollup 
having Grouping(语文)=1 
and Grouping(数学)=1 
and Grouping(英语)=1 

（编辑：李大同）

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