IDENTITY reset in SQL Server

We will have a look at IDENTITY value reset and explicit insert in database tables.

In certain scenarios you may need to start your IDENTITY column value from a new number. CHECKIDENT command can be used to force the table to restart the auto increment number.

Syntax,


Code:
DBCC CHECKIDENT (<TableName>, RESEED, <yourReseedValue>)


For example, to start employee id from 5000, use the following command.

Code:
DBCC CHECKIDENT ("DataBaseName.Employee", RESEED, 5000);
GO


Insert on IDENTITY Column

In some cases you may need to insert some values to Identity column. Table will throw a warning message if tried to insert a value to auto increment value column. To insert the value in auto number value column, IDENTITY_INSERT should be set to ON and after the insert, it can set it back to OFF.


Syntax,


Code:
SET IDENTITY_INSERT <TableName> ON
-- Insert statement
SET IDENTITY_INSERT <TableName> OFF


Example,

Code:

SET IDENTITY_INSERT Employee ON

INSERT INTO Empoyee (ID,NAME) VALUES ( 5003 , �Sam� );

SET IDENTITY_INSERT Employee OFF

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