Sql Server 2012 has introduced SEQUENCE
objects, which allow you to generate sequential numeric values not associated with any table.
Creating them are easy:
CREATE SEQUENCE Schema.SequenceName
AS int
INCREMENT BY 1 ;
An example of using them before insertion:
DECLARE @NextID int ;
SET @NextID = NEXT VALUE FOR Schema.SequenceName;
-- Some work happens
INSERT Schema.Orders (OrderID, Name, Qty)
VALUES (@NextID, 'Rim', 2) ;
See my blog for an in-depth look at how to use sequences:
http://sqljunkieshare.com/2011/12/11/sequences-in-sql-server-2012-implementingmanaging-performance/