Mysql一條sql語句實現數據去重操作

如果不加黑體部分會報1093錯誤，
原因：Mysql在執行修改或刪除的時候，子查詢不能是同一張表

1、第一種方式：

DELETE FROM users WHERE user_id NOT IN 

(SELECT temp.user_id FROM

(SELECT MAX(user_id) user_id FROM users GROUP BY name, age 
having COUNT(*) >= 1)

temp)

2、第二種方式：

循環執行如下語句

DELETE users  FROM users , (SELECT user_id FROM users 
    GROUP BY name, age 
    having COUNT(*) > 1) AS t1
WHERE users .user_id = t1.qzkh_id