October 2012
Intermediate to advanced
238 pages
5h 17m
English
Content preview from What's New in SQL Server 2012Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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SEQUENCE
You are no doubt used to IDENTITY and how this works with a seed and increment value. SEQUENCE is structured in a very similar way, but with fewr limitations, giving it a welcome flexibility.
A SEQUENCE object is created at the database level but, unlike an IDENTITY property, it can be used across multiple tables. An IDENTITY value is generated when you insert a row into a table and it cannot be updated. You can retrieve the SEQUENCE value at any time and reset it without altering its previous value, and even set a minimum and maximum value. Let us look at a simple example:
CREATE SEQUENCE mySequence AS int START WITH 1 INCREMENT BY 1
As you can see, mySequence is now available for use by all tables in the database:
We have not used the ...
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