How to Reset Identity Column Values in Sql Server

[Origin]: http://www.c-sharpcorner.com/blogs/how-to-reset-identity-column-values-in-sql-server1

Step 1: Create table.

CREATE TABLE dbo.Emp
(
  ID INT IDENTITY(1,1),
  Name VARCHAR(10)
)

Step 2: Insert some sample data.

INSERT INTO dbo.Emp(name)
VALUES ('Rakesh')
INSERT INTO dbo.Emp(Name)
VALUES ('Rakesh Kalluri')

When we run above query the second insert statement will failed because of varchar(10) length.

Step 3: Check the identity column value.

DBCC CHECKIDENT (<span class="string">'Emp'</span>)

Even second insert was failed but the identity value is increased .if we insert the another record the identity value is 3.

INSERT INTO dbo.Emp(Name)
VALUES ('Kalluri')

SELECT * FROM Emp

Step 4: Reset the identity column value.

DELETE FROM EMP WHERE ID=3

DBCC CHECKIDENT ('Emp', RESEED, 1)

INSERT INTO dbo.Emp(Name)
VALUES ('Kalluri')

SELECT * FROM Emp

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