Sql server SQL触发器错误代码

我正在尝试开发一个SQL Server触发器，但当我更新具有与触发器关键字值相同的值的记录时，它似乎为我抛出了一个错误，但如果只有一个记录与该值匹配，则不会抛出错误

错误代码：

关于我为SNL开发的触发器，它似乎产生了一个错误：子查询返回的值超过1。当子查询在=、！=、=或者当子查询用作表达式时。声明已终止

触发代码：

USE [TestTrigger]
GO
/****** Object:  Trigger [dbo].[TestTrigger]    Script Date: 06/04/2015 08:29:34 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[TestTRigger]
   ON  [dbo].[SN_Contact2]
   FOR INSERT,UPDATE
AS 
BEGIN

        DECLARE @IDSTATUS varchar(254)
        DECLARE @CONTACTID VARCHAR(36)
        DECLARE @CLIENTURL nvarchar(254)
        set @CONTACTID = (select contact_contactid from inserted)
        set @IDSTATUS = (select contact_category from inserted)
        set @CLIENTURL = (select CUST_1004 from inserted)

        IF @IDSTATUS = 'Client'
        BEGIN

                                update sn_contact2 set CUST_ID_Status_Change_Date = getdate()
                where CUST_Main_Contact = 'X' and cust_id_status_change_date is null
                and CUST_1004 = @CLIENTURL
        END


END

---

有什么想法吗？

这些都是断层线。。当通过单个查询更新/插入超过1条记录时，您将收到此错误（因为子查询返回的值超过1…）

将更新查询从单行更新更改为类似：

update sn_contact2 set CUST_ID_Status_Change_Date = getdate()
                where CUST_Main_Contact = 'X' and cust_id_status_change_date is null
                and CUST_1004 --= @CLIENTURL
in (
select CUST_1004 from inserted where contact_category = 'Client'
)

---

谢谢你，先生！我要试试那个。非常感谢：）

update sn_contact2 set CUST_ID_Status_Change_Date = getdate()
                where CUST_Main_Contact = 'X' and cust_id_status_change_date is null
                and CUST_1004 --= @CLIENTURL
in (
select CUST_1004 from inserted where contact_category = 'Client'
)