Oracle分組查詢1——rullup

Oracle分組查詢1——rullup eg.按工齡、部門、職務 從大到小 查詢工資和 select to_char(b.hiredate) as 上班日期,a.dname as 部門,b.job as 職務,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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