SQL SERVER – Negative Identity Seed Value and Negative Increment Interval

I just had interesting conversation with one of my friend who said identity value can not start from Zero. I told him that it can even start from negative value. He did not believe it. I quickly come with example and he was surprised to see it. USE [AdventureWorks]GOIF EXISTS (SELECT * FROM sys.objects WHERE OBJECT_ID = OBJECT_ID(N'[dbo].[IdentityNegative]') AND TYPE IN (N'U'))DROP TABLE [dbo].[