Question

我正在使用sqlserver，当我从Xtable删除重复行时，我创建了从YTable中删除的Trigger。注意：YTable有一个来自XTable的外键为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中删除重复的行

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

（0行（s）受影响）AFTER DELETE TRIGGER被解雇。

（1271060行（s）受影响）

请问这些查询的错误

非常感谢

Answer 1

声明

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

当您从XTable删除多条记录时，

将无法正常工作，因为您无法将多个ID放入单个整数变量中。

您只需将触发器中的删除语句更改为

即可

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

从另一个相关表中删除重复行时，创建一个从表中删除的触发器

1 个答案: