IDENTITY [ (seed , increment ) ]


1> CREATE TABLE MyTable (MyID Int IDENTITY NOT NULL
2>                     , MyDescription nVarChar(50) NOT NULL)
3> GO
1>
2> -- IDENTITY [ (seed , increment ) ]
3>
4> insert mytable (mydescription) values ('a');
5> GO

(1 rows affected)
1> insert mytable (mydescription) values ('b');
2> GO

(1 rows affected)
1> insert mytable (mydescription) values ('c');
2> GO

(1 rows affected)
1> select * from mytable
2> GO
MyID        MyDescription
----------- --------------------------------------------------
          1 a
          2 b
          3 c

(3 rows affected)
1>
2> drop table MyTable
3> GO
1>

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1.	IDENTITY (1, 1)
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3.	SQL Server chooses the highest number as its current seed for a positive increment value or the lowest for a negative increment value
4.	SQL Server does not allow explicit values to be inserted into it
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IDENTITY [ (seed , increment ) ] : IDENTITY « Sequence « SQL Server / T-SQL

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