一句Sql把纵向表转为横向表，并分别分组求平均和总平均值(英语语文)

测试sql语句如下:

复制代码代码如下:

 
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,Student,Course,Quantity) values('A班','张三','数学',70); 

insert into @tab(Class,Student,Course,Quantity) values('A班','张三','英语',80); 

insert into @tab(Class,Student,Course,Quantity) values('A班','李四','语文',30); 

insert into @tab(Class,Student,Course,Quantity) values('A班','李四','数学',40); 

insert into @tab(Class,Student,Course,Quantity) values('A班','李四','英语',50); 
insert into @tab(Class,Student,Course,Quantity) values('B班','王五','语文',65); 

insert into @tab(Class,Student,Course,Quantity) values('B班','王五','数学',75); 

insert into @tab(Class,Student,Course,Quantity) values('B班','王五','英语',85); 

insert into @tab(Class,Student,Course,Quantity) values('B班','赵六','语文',35); 

insert into @tab(Class,Student,Course,Quantity) values('B班','赵六','数学',45); 

insert into @tab(Class,Student,Course,Quantity) values('B班','赵六','英语',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,Student 

,(select isnull(sum(Quantity),0) from @tab where Class=t.Class and Student=t.Student and Course='语文') as '语文' 

,(select isnull(sum(Quantity),0) from @tab where Class=t.Class and Student=t.Student and Course='数学') as '数学' 

,(select isnull(sum(Quantity),0) from @tab where Class=t.Class and Student=t.Student and Course='英语') as '英语' 

,(select isnull(sum(Quantity),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,Student,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