MySQL分組排序求Top N

表結構 sql   按照grp分組，按照num排序，每組取Top 3，輸出結果以下：code     源代碼：blog 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 WHE

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