關於rollup的簡單用法和層次查詢

select t.deptno,t.job,sum(sal) from emp t group by rollup(t.deptno,t.job); 等價於 web select t.deptno,t.job,sum(sal) from emp t group by t.deptno,t.job + select t.deptno,sum(sal) from emp t group by t.de

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