CREATE TABLE t_testscore( pk_id INT PRIMARY KEY, c_name VARCHAR(50) , c_score INT, c_class INT )DEFAULT CHARSET=utf8;INSERT INTO t_testscore VALUES (1, '張三6', 66, 1),(2, '張三5', 65, 1),(3, '張三4', 64, 1), (4, '張三3', 63, 1),(5, '張三2', 62, 1);INSERT INTO t_testscore VALUES (11, '李四6', 76, 2),(12, '李四5', 75, 2),(13, '李四4', 74, 2), (14, '李四3', 73, 2),(15, '李四2', 72, 2);SELECT * FROM t_testscore t WHERE EXISTS(SELECT COUNT(*) FROM t_testscore ts WHERE ts.c_score>=t.c_score GROUP BY ts.c_class HAVING COUNT(*)<=3) ORDER BY c_class,c_score DESC;

轉載于:https://www.cnblogs.com/nyist-xsk/p/10636985.html

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