Adding auto incrementing primary key to an existing table in SQL SERVER 2005

Question

I have a table with 8,000 rows of data and will be adding more. but I forgot to put a primary key in the beginning. so that each row has a unique key. later i added a primar

Answer 1

Get rid of the column you just added. Then run this

ALTER TABLE table
ADD ID INT IDENTITY

ALTER TABLE table
ADD CONSTRAINT PK_table
PRIMARY KEY(ID)