Need help to implement Primary Key.

[Gambhir Singh <gambhir.singh05@xxxxxxxxx>]

Hi,

I have a table with a record count of ~500 million (496,098,390). There is no primary key in this table. Now I need to set up a primary key on this table. I can't find a way to set up a primary key. I tried to add a new column with IDENTITY but it is not allowing null value for existing rows and I don't know how to update the unique value for existing records.

Please help me to implement the same.

Thanks & Regards
Gambhir Singh