Identity start from maxid of other table

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I have a table in production DB with ID int identity (1,1).
I am trying to add new data to it via SSIS but the table in STG has also the same int identity (1,1) which starts from 1 and I need to start from the max id from table in DB production.
Then i have a merge script that insert new data upon id
How should approach this?

What I have tried:

I have tried to change the store procedure:

CREATE PROCEDURE spmaxid
as 
BEGIN 
	SELECT  max([ID])
FROM [Production].[dbo].[UNITS] 
END

then this:

UPDATE [dbo].[STG UNITS] SET id = NULL
GO 

DECLARE @id INT 
SET @id =  Spmaxid
UPDATE [STG].[dbo].[STG UNITS] 
SET @id = id = @id + 1
GO 

SELECT * FROM [STG UNITS] 
GO

Posted 10-Dec-20 4:33am

Member 15017650

Updated 13-Dec-20 21:38pm

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Richard Deeming · Answer 1 · 2020-12-10T05:01:00

The simple solution would be:

SQL

DECLARE @MaxId int;
SELECT @MaxId = MAX(ID) FROM Production.dbo.UNITS;

UPDATE
    STG.dbo.[STG UNITS]
SET
    id = IsNull(@MaxId, 0) + id
;

If your staging table has gaps in the IDs, and you want to get rid of the gaps:

SQL

DECLARE @MaxId int;
SELECT @MaxId = MAX(ID) FROM Production.dbo.UNITS;

WITH cte As
(
    SELECT
        id,
        ROW_NUMBER() OVER (ORDER BY id) As RN
    FROM
       STG.dbo.[STG UNITS] 
)
UPDATE 
    S
SET 
    id = IsNull(@MaxId, 0) + R.RN
FROM
    STG.dbo.[STG UNITS] As S
    INNER JOIN cte As R ON R.id = S.id
;

CHill60 · Answer 2 · 2020-12-13T21:38:00

In addition to Solution 1 and in response the OP comment in a solution
You cannot update identity columns without a little bit of extra work

e.g.

SQL

SET IDENTITY INSERT STG.dbo.[STG UNITS] ON

see SET IDENTITY_INSERT (Transact-SQL) - SQL Server | Microsoft Docs[^]. Do what you need to do in terms of inserting the new records, and then remember to

SQL

SET IDENTITY INSERT STG.dbo.[STG UNITS] OFF

OR
You can use DBCC CHECKIDENT (Transact-SQL) - SQL Server | Microsoft Docs[^]

Identity start from maxid of other table

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