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

As per your requirement you just needed a sql query that will update the entire table with the new primary key values in an incremental fashion. Here is is :

UPDATE myTable
SET ID = ID + 1

Where ID is the PK field name

Once Updated do not forget to add identity column as shown below :

ALTER TABLE table
ADD ID INT IDENTITY

ALTER TABLE table
ADD CONSTRAINT PK_table
PRIMARY KEY(ID)