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MySQL分组排序求Top N 表结构   按照grp分组，按照num排序，每组取Top 3，输出结果如下：     源代码： SELECT * FROM score AS t3 WHERE ( SELECT COUNT(*) FROM score AS t1 LEFT JOIN score AS t2 ON t1.grp = t2.grp AND t1.num < t2.num WHERE t1.id = t3.id ) < 3 ORDER BY t3.g