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topn
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‎optimizer/topn/eg1.sql‎

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ELECT deptno, job, APPROX_SUM(sal),
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connect scott/tiger
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SELECT deptno, job, APPROX_SUM(sal),
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APPROX_RANK(partition by deptno ORDER BY APPROX_SUM(sal) desc) rk
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FROM emp
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GROUP BY deptno, job

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