删除使用子查询和相交？

Question

我尝试使用下面的查询，删除，但遗憾的是，所有的记录都被删除

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

    INTERSECT 

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

如何正确使用子查询从源表中删除相应的记录？

这两个表格中没有任何键或约束。

Answer 1

试试这个

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检测记录被删除：

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)