Question

Possible Duplicate:
how to set auto increment after creating a table without any data loss?

How do I modify the primary key column (integer type) of a SQL Server 2012 table so that it’s auto-generated?

Answer 1

CREATE TABLE dbo.Test(PkCol int CONSTRAINT PK_Test_PkCol PRIMARY KEY, OtherCol varchar(1));

ALTER TABLE dbo.Test
DROP CONSTRAINT PK_Test_PkCol 
GO
ALTER TABLE dbo.Test DROP COLUMN PkCol
ALTER TABLE dbo.Test
ADD PkCol int IDENTITY(1,1) CONSTRAINT PK_Test_PkCol PRIMARY KEY
GO

IDENTITY