Oracle分组查询1——rullup

Oracle分组查询1——rullup eg.按工龄、部门、职务 从大到小 查询工资和 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 rollup(  to_char(b.hired

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