如何在插入触发器SQL Server中检索Identity列值

Question

I have two tables that are identical except one has an identity column and the other doesn't. Instead the second table uses the value of the identity column from the first table. I thought I would insert into the second table as a trigger when a record is inserted into the first table. I cannot seem to get syntax right.

Null is being returned from the identity column @EDVisitId.

ALTER TRIGGER [dbo].[trgInserterrEDVisitOriginal] ON [dbo].[errEDVisit]
AFTER INSERT
AS


--Name:  Bob Avallone
--Date:  6-15-2017
--
--  The purpose of this trigger is to insert a record into errEDVisitOriginal
--  whenever a new errEDVisit is inserted.

--XXXXXXXXXX



    declare @EDVisitId  int
    declare @SubmissionControlID INT


Select  @EDVisitId = EDVisitID from inserted
SELECT @SubmissionControlID = SubmissionControlID  from Inserted


  Begin

Insert Into errEDVisitOriginal (EDVisitId, SubmissionControlID)

VALUES (@EDVisitId, @SubmissionControlID )



End

Answer 1

Thanks for all the suggestions. I abandoned the idea of a trigger. Instead I simply insert the new records from the first table into the second one. See below.

Insert errEDVisitOriginal(EdVisitId, SubmissionControlID)
    Select EdVisitId,  SubmissionControlID 
    from errEDVisit where SubmissionControlID = @SubmissionControlID

Answer 2

you just need scope_identity()

Select @EDVisitId = scope_identity()

Answer 3

You can use SCOPE_IDENTITY to get the last inserted id from the first table put it into a variable then insert into the second table.

https://docs.microsoft.com/en-us/sql/t-sql/functions/scope-identity-transact-sql

Answer 4

Though the decision to duplicate information intentionally is dubious, you are vastly over-thinking the code. Just:

if exists (select * from inserted)
insert dbo.errEDVisitOriginal (EDVisitId, SubmissionControlID)
select EDVisitId, SubmissionControlID from inserted;