第28章 高级分组函数

select deptno,sum(sal) from emp group by deptno

union all

select null,sum(sal) from emp;

 

 

 

 

 

 

 

 

分组的规则

grouping 查看列是否参与分组

为0的就是参与分组了，为1就是没有参与分组

select deptno,job,sum(sal),grouping(deptno),grouping(job) from emp group by cube(deptno,job);

 

rouping sets()合并分组

select deptno,null job,sum(sal) from emp group by deptno

union all

select null,job,sum(sal) from emp group by job;

select deptno,job,sum(sal) from emp group by grouping sets(deptno,job);