mysql中查找重複的記錄

因數據重複導入了數據庫，需要把重複的記錄查找出來並且刪除掉，只保留id小的哪一個記錄

1、經過測試，可以查找出重複的記錄：

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語句可以刪除重複的記錄，保留id小的哪一個記錄

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