查詢不想要工作得很好^^

Question

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

當子查詢不是用EXISTS引入時，只能在選擇列表中指定一個表達式。

Answer 1

您需要使用IN並從項目表中指定一個字段（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

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

或使用JOIN我更喜歡，

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

明星應該是替換爲正確的列名稱。還要確保子查詢只返回一行。不是多行。如果有多行，則需要改爲將相等比較改爲IN子句。

Answer 4

將其更改爲SELECT ItemID FROM _Items ...。錯誤非常明顯：您的子查詢不允許返回多個列，因爲ItemID只能與單列進行比較。在EXISTS這將是相當於返回1或0，這仍然是一個單一的柱，從而允許的。