MySQL DELETE使用有和計數的子查詢

Question

我試圖使用以下查詢刪除多個條目：

首先，我使用此查詢找到要刪除的條目：

SELECT guid FROM account GROUP BY guid,type HAVING count(type) > 1);

然后我將此查詢添加到DELETE語句：

DELETE FROM account WHERE guid IN (SELECT guid FROM account GROUP BY guid,type HAVING count(type) > 1);

但我得到這個錯誤：

您無法在FROM子句中為更新指定目標表'account'

Answer 1

我認為您需要使用臨時表來滿足您的需求，如下所示：

1. 第1步：創建臨時表

    CREATE TEMPORARY TABLE MyTemp SELECT guid FROM account GROUP BY guid,type HAVING count(type) > 1; 

2. 在delete語句中使用臨時表

    DELETE FROM account WHERE guid IN (SELECT guid FROM MyTemp); 

3. 刪除臨時表

    DROP TEMPORARY TABLE MyTemp; 

編輯：我認為使用* 兩個嵌套表的方法也有效：

  DELETE FROM account 
    WHERE guid IN 
     (SELECT guid FROM 
       (SELECT guid FROM account 
       GROUP BY guid,type HAVING count(type) > 1) as MyTemp
    )

Answer 2

你的問題解決了，就像下面這樣做..

    DELETE FROM account 

      WHERE guid IN 

     (SELECT * FROM 

       (SELECT guid FROM account 

          GROUP BY guid,type 

          HAVING  count(type) > 1) AS a);

Answer 3

首先創建視圖

create view view_acct as 
SELECT guid FROM account 
GROUP BY guid,type HAVING count(type) > 1;

使用后查看

DELETE FROM account WHERE guid in (select * from view_acct);