reset identity column in sql server
snippet in sql

tsql reseed identity

user2850

USE AdventureWorks2012;  
GO  
DBCC CHECKIDENT ('Person.AddressType', RESEED, 10);  
GO  

reset identity column in sql server

user2294

DBCC CHECKIDENT ('YourTableName', RESEED, 1)

reseed sql table primary key

user5462

DBCC CHECKIDENT ('YourTableName', RESEED, 1)