我想更新SMSCAMID，如果它是null否则没有变化？

问题描述

这里是我的代码，但它不起作用

Here my code but its not worked

ALTER proc [exeuser].[updateCampaignId]
@SMSText varchar(max)
as begin
declare @id int=(select ID from dbo.tblCampaignMaster 
where SMSTEXT=@SMSText)
 
update tblSMSSendData set  SMSCAMPID= case when SMSCAMPID is null then @id end where SMSTEXT=@SMSText 
end

我尝试过：

What I have tried:

ALTER proc [exeuser].[updateCampaignId]
@SMSText varchar(max)
as begin
declare @id int=(select ID from dbo.tblCampaignMaster 
where SMSTEXT=@SMSText)
 
update tblSMSSendData set  SMSCAMPID= case when SMSCAMPID is null then @id end where SMSTEXT=@SMSText 
end

推荐答案

update tblSMSSendData set  SMSCAMPID=  @id   where SMSTEXT=@SMSText and SMSCAMPID is null 

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