1、如果只有一个字段数据重复
自关联,保留id最小的那一条,其它的都删除 DELETE t1 FROM user t1, user t2 WHERE t1.user_code = t2.user_code AND t1.id > t2.id;
2、如果是全部字段都相同
delete from user where user_code in ( select user_code from ( select user_code from user group by user_code HAVING count(user_code ) > 1) t) limit 1;
参考:https://blog.csdn.net/qq_41602468/article/details/119010077
https://www.cnblogs.com/cjsblog/p/16401882.html