一句Sql把纵向表转为横向表,并分别分组求平均

2023年 4月 17日 38.6k 0

效果如图所示: 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'

效果如图所示: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

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