Adding column with primary key in existing table

Question

I am trying to add primary key to newly added column in existing table name Product_Details.

New Column added: Product_Detail_ID (int

Answer 1

If you want SQL Server to automatically provide values for the new column, make it an identity.

ALTER TABLE Product_Details DROP COLUMN Product_Detail_ID
GO
ALTER TABLE Product_Details ADD Product_Detail_ID int identity(1,1) not null
GO
ALTER TABLE Product_Details
add CONSTRAINT pk_Product_Detils_Product_Detail_ID primary key(Product_Detail_ID)
GO