Oracle分组查询3——grouping sets
多个单列查询汇总
eg. 按入职日期、部门、职务 分别汇总工资和
select to_char(b.hiredate) as 上班日期,a.dname as 部门,b.job as 职务,sum(b.sal) sum_sal from dept a, emp b
where a.deptno=b.deptno group by grouping sets(
to_char(b.hiredate),a.dname,b.job )
综合查询：
select to_char(b.hiredate) as 上班日期,a.dname as 部门,b.job as 职务,sum(b.sal) sum_sal from dept a, emp b
where a.deptno=b.deptno group by grouping sets(
rollup( to_char(b.hiredate)),cube(a.dname,b.job ))