刪除使用子查詢和相交？

Question

我嘗試使用下面的查詢，刪除，但遺憾的是，所有的記錄都被刪除

DELETE [dbo].[devicelinks] 
FROM 
    (SELECT * 
    FROM [dbo].[devicelinks] 
    WHERE PID = 7 

    INTERSECT 

    SELECT * 
    FROM ASC.dbo.DEVICE_LINK 
    WHERE PID = 7) 

如何正確使用子查詢從源表中刪除相應的記錄？

這兩個表格中沒有任何鍵或約束。

Answer 1

試試這個

delete [dbo].[devicelinks] 
from [dbo].[devicelinks] 
    inner join ASC.dbo.DEVICE_LINK 
    on [dbo].[devicelinks].PID = ASC.dbo.DEVICE_LINK.PID 
where [dbo].[devicelinks].PID = 7 

Answer 2

您可以使用EXISTS檢測記錄被刪除：

DELETE d1 
FROM [dbo].[devicelinks] d1 
WHERE PID = 7 AND EXISTS (SELECT * 
          FROM ASC.dbo.DEVICE_LINK AS d2 
          WHERE d1.PID = d2.PID AND 
           d1.[DEVICEID] = d2.[DEVICEID] AND 
           ... rest of the fields here)