Usage of sequence in SQL Server 2012

Question

I have SQL Server 2012 and I want to know what's the usage of sequence. I Look for a sample to explain usage of sequence.

EDIT

I know create and use Sequence in database. I want to know what is practical scenario for use of Sequence.

Answer 1

CREATE SEQUENCE dbo.OrderIDs
    AS INT
    MINVALUE 1
    NO MAXVALUE
    START WITH 1;

SELECT NextOrderID = NEXT VALUE FOR dbo.OrderIDs
UNION ALL     SELECT NEXT VALUE FOR dbo.OrderIDs
UNION ALL     SELECT NEXT VALUE FOR dbo.OrderIDs;

Results:

NextOrderID
-----------
1
2
3

See here for original source and more examples. The page refers to SQL Server Denali which is the beta of SQL 2012 but the syntax is still the same.