DELETE的MySQL在一個表中

Question

我有一個數據庫只有一個表如下：

userurltag(id,userID(string),Url(String),tag(String)) 

我想刪除具有與之相關的不到3個網址的用戶。 我該怎麼做？

Answer 1

試試這個：

DELETE 
    FROM userurltag USING userurltag 
    JOIN 
     (SELECT userID 
     FROM userurltag 
     GROUP BY userID HAVING COUNT(*) < 3) as tmp 
ON userurltag.userID = tmp.userID; 

Answer 2

DELETE 
FROM userurltag 
WHERE UserID IN 
(SELECT UserID FROM userurltag GROUP BY userID Having COUNT(UserID) < 3)