SELECT t1.empno,t1.sal,t1.deptno, (SELECT COUNT( t2.sal)+1 FROM emp t2 WHERE t1.deptno=t2.deptno AND t1.sal > t2.sal) rn FROM emp t1 ORDER BY t1.deptno,rn; EMPNO SAL DEPTNO RN 7934 1300.00 10 1 7782 2450.00 10 2 7839 5000.00 10 3 7369 800.00 20 1 7566 2975.00 20 2 7902 3000.00 20 3 7900 950.00 30 1 7654 1250.00 30 2 7521 1250.00 30 2 7846 1500.00 30 4 7844 1500.00 30 4 7845 1500.00 30 4 7499 1600.00 30 7 7698 2850.00 30 8
mysql实现Oracle中row_number over partition by
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