mysql删除重复表数据

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建表

DROP TABLE IF EXISTS del_repeat;
CREATE TABLE del_repeat (
id int(11) NOT NULL AUTO_INCREMENT,
f1 varchar(10) DEFAULT NULL,
f2 varchar(10) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=37 DEFAULT CHARSET=utf8;

初始化书籍

INSERT INTO del_repeat(f1,f2) VALUES(‘a1’,’b1’);
INSERT INTO del_repeat(f1,f2) VALUES(‘a1’,’b1’);
INSERT INTO del_repeat(f1,f2) VALUES(‘a2’,’b2’);
INSERT INTO del_repeat(f1,f2) VALUES(‘a3’,’b3’);
INSERT INTO del_repeat(f1,f2) VALUES(‘a3’,’b3’);
INSERT INTO del_repeat(f1,f2) VALUES(‘a6’,’b6’);

查看

SELECT * FROM del_repeat;

删除重复数据

DELETE FROM del_repeat
WHERE id NOT IN(
SELECT id
FROM (
SELECT MIN(id) AS id
FROM del_repeat
GROUP BY f1,f2
) a

)