MSSQL Server 對已經存在的 table 增加識別 id 欄位 (從1開始)

Sql Server add auto increment primary key to existing table

No - you have to do it the other way around: add it right from the get go as INT IDENTITY - it will be filled with identity values when you do this:

ALTER TABLE dbo.YourTable
  ADD ID INT IDENTITY

and then you can make it the primary key:

ALTER TABLE dbo.YourTable
  ADD CONSTRAINT PK_YourTable
  PRIMARY KEY(ID)

REF: http://stackoverflow.com/questions/4862385/sql-server-add-auto-increment-primary-key-to-existing-table