mysql中查找重复的记录

因数据重复导入了数据库，需要把重复的记录查找出来并且删除掉，只保留id小的哪一个记录

1、经过测试，可以查找出重复的记录：

SELECT * FROM deviceman.deviceman_user_list WHERE full_name IN (SELECT full_name FROM deviceman.deviceman_user_list GROUP BY full_name HAVING COUNT(full_name)>1);

 

 

2、以下sql语句可以删除重复的记录，保留id小的哪一个记录

Delete HZT Where ID Not In (Select Max(ID) From HZT Group By Title)