mysql刪除一張表中的重複資料
阿新 • • 發佈：2020-09-02
DROP TABLE IF EXISTS `imooc_goddess`; CREATE TABLE `imooc_goddess` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_name` varchar(30) NOT NULL, `sex` int(11) DEFAULT NULL, `age` int(11) DEFAULT NULL, `birthday` date DEFAULT NULL, `email` varchar(30) DEFAULT NULL, `mobile` varchar(11) DEFAULT NULL, `create_user`varchar(30) DEFAULT NULL, `create_date` date DEFAULT NULL, `update_user` varchar(30) DEFAULT NULL, `update_date` date DEFAULT NULL, `isdel` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8;
INSERT INTO `imooc_goddess` VALUES ('2', '小彭', null, '23', null, null, null, null, null, null, null, null); INSERT INTO `imooc_goddess` VALUES ('6', '胖子', '0', '78', '2016-10-03', '[email protected]', '1211555599', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('7', '小溪', '0', '34', '2016-10-03', '[email protected]', '1211555599', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('9', '小霞', null, '23', '1990-09-09', '[email protected]', '232445455', null, '2016-10-03', null, '2016-10-03', null);INSERT INTO `imooc_goddess` VALUES ('10', 'hh', '1', '23', '1990-09-09', 'jkjfskf', '12323', 'Admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('121', '平', '1', '23', '2998-04-09', '[email protected]', '1323', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('121', '航母', '1', '23', '2333-09-09', 'jkksjkjf', '1232', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('232', '胖紙', '1', '23', '1991-09-09', 'jjijijij', '1323244', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('343', '校長', '1', '18', '1998-09-09', '[email protected]', '112323424', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('111', '航母', '1', '23', '2333-09-09', 'jkksjkjf', '1232', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('222', '胖紙', '1', '23', '1991-09-09', 'jjijijij', '1323244', 'admin', '2016-10-03', 'admin', '2016-10-03', '1'); INSERT INTO `imooc_goddess` VALUES ('333', '校長', '1', '18', '1998-09-09', '[email protected]', '112323424', 'admin', '2016-10-03', 'admin', '2016-10-03', '1');
DELETE FROM imooc_goddess
where (email,user_name,mobile) in
#找出 email,user_name,mobile 欄位重複的資料
( select a.email,a.user_name,a.mobile from (select email,user_name,mobile from imooc_goddess GROUP BY email,user_name,mobile HAVING count(id)>1) a) and id not in
# 保留重複資料中id 最小的一行不刪除。
( SELECT b.ID from (select min(id) ID from imooc_goddess GROUP BY email ,user_name,mobile HAVING count(id)>1) b);