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How to insert values into IDENTITY column

Identity columns commonly used as primary keys in tables. These columns are automatically values are assigned when ever new record inserted into a table.

IF OBJECT_ID('Employee','U') IS NOT NULL
DROP TABLE Employee


Ceating the Emlployee table


CREATE TABLE Employee
(
  ID INT IDENTITY(1,1) PRIMARY KEY ,
  NAME VARCHAR(20),
  SALARY INT
)

INSERT INTO Employee
SELECT 'Rakesh',5000
UNION ALL
SELECT 'Ramu',6000
UNION ALL
SELECT 'Naresh',7000


SELECT * FROM Employee









In below scenario trying to insert value into identity column.

INSERT INTO Employee (ID,NAME,SALARY) VALUES(4,'Sravan',10000)

When ever tring to insert value into idenity column  of ID we get follwing follwing error.

Msg 544, Level 16, State 1, Line 1
Cannot insert explicit value for identity column in table 'Employee' when IDENTITY_INSERT is set to OFF.

By enabling IDENTITY_INSERT on a table  insert value into identity column.

SET IDENTITY_INSERT Employee  ON

INSERT INTO Employee (ID,NAME,SALARY) VALUES(4,'Sravan',10000)

SET IDENTITY_INSERT Employee  OFF

(1 row(s) affected)

SELECT * FROM Employee









Key points about IDENTITY_INSERT:

·         It can only be enabled on one table at a time.

·         When it is enabled on a table you must specify a value for the identity column.

·         The user issuing the statement must own the object, be a system administrator (sysadmin role), be the database owner (duo) or be a member of the db_ddladmin role in order to run the command

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