Question

尝试使用以下查询删除多个条目：

首先，我使用此查询找到要删除的条目：

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

然后我将此查询添加到DELETE语句：

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

但是我收到了这个错误：

您无法在FROM子句

中为更新指定目标表'account'

Answer 1

我认为您需要使用临时表来满足您的需求，如下所示：

步骤1：创建临时表

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

使用删除语句中的临时表

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

删除临时表
```
DROP TEMPORARY TABLE MyTemp;
```

编辑：我认为使用* 两个嵌套表的解决方案也有效：

  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

您的问题已解决，请执行以下操作..

    DELETE FROM account 

      WHERE guid IN 

     (SELECT * FROM 

       (SELECT guid FROM account 

          GROUP BY guid,type 

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

Answer 3

首先创建视图

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

使用视图后

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

MySQL DELETE使用有和计数的子查询

3 个答案: