Question

DELETE FROM _Inventory 
where ItemID = ( 
    SELECT * 
    FROM _Items 
    WHERE RefItemID IN ( 46440 , 46441 , 46442 ) 
        AND ID64 = @ID64 )

当EXISTS没有引入子查询时，只能在选择列表中指定一个表达式。

Answer 1

您需要使用IN并指定项目表中的字段（而不是指定*）：

DELETE FROM _Inventory 
WHERE ItemID IN (
    SELECT ItemId 
    FROM _Items 
    WHERE RefItemID IN ( 46440 , 46441 , 46442 ) AND ID64 = @ID64 )

Answer 2

只需使用IN

即可

DELETE 
FROM _Inventory 
where ItemID IN ( SELECT ItemID 
                  FROM _Items 
                  WHERE RefItemID IN (46440 ,46441 ,46442) 
                        AND ID64 = @ID64 
                )

或使用我更喜欢的JOIN，

DELETE  a
FROM    _Inventory a
        INNER JOIN _Items b
            ON a.ItemID = b.ItemID
WHERE   b.RefItemID IN (46440, 46441, 46442) AND
        b.ID64 = @ID64

Answer 3

应使用正确的列名替换星号。还要确保子查询只返回一行。不是多行。如果有多行，则需要将等同性比较改为IN子句。

Answer 4

将其更改为SELECT ItemID FROM _Items ...。错误非常明确：不允许子查询返回多个列，因为ItemID只能与单个列进行比较。在EXISTS中，这相当于返回1或0，这仍然是一个列，因此也允许。

查询不想工作得很好^^

4 个答案: