当从另一个相关表中删除重复行时，创建触发器以从表中删除

Question

我正在使用sqlserver，当我从Xtable删除重复行时，我创建了触发器以从YTable中删除。 注：YTable具有XTable一个外键On_ID

触发查询

CREATE TRIGGER trgAfterDeletev4 ON XTable 

AFTER DELETE 
AS 
declare @empid int; 

select @empid=d.[On_ID] from deleted d; 

Delete from YTable 
where [On_ID]= @empid 
PRINT 'AFTER DELETE TRIGGER fired.' 

从XTable

WITH C AS(
    SELECT *, 
     RN = ROW_NUMBER()OVER(PARTITION BY [col1] ORDER BY [col2]) 
    FROM [Sourcing].[src].XTable 
) 
    DELETE FROM C WHERE RN > 1 

结果中删除重复的行

（0行（S ）受到影响）AFTER DELETE TRIGGER开枪。

（1271060行（S）的影响）

请有什么不对这些查询的

非常感谢你

Answer 1

声明

select @empid=d.[On_ID] from deleted d 

将无法​​正常工作当你从XTable删除多于一条记录的情况，因为你不能放置多个ID转换为单个整数变量。

你可以简单地改变触发你的DELETE语句

Delete from YTable 
where [On_ID] in (select [On_ID] from deleted)