Auto increment primary key in SQL Server Management Studio 2012

Question

How do I auto increment the primary key in a SQL Server database table, I\'ve had a look through the forum but can\'t see how.

Answer 1

Make sure that the Key column's datatype is int and then setting identity manually, as image shows

Or just run this code

-- ID is the name of the  [to be] identity column
ALTER TABLE [yourTable] DROP COLUMN ID 
ALTER TABLE [yourTable] ADD ID INT IDENTITY(1,1)

the code will run, if ID is not the only column in the table

image reference fifo's