July 2012
Intermediate to advanced
816 pages
27h 38m
English
Content preview from Programming Microsoft® 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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The SEQUENCE Object
Historically, one notable difference between SQL Server and other database platforms (such as Oracle and DB2) has been the manner in which you implement automatically assigned integer values for primary keys when inserting new rows. SQL Server provides the IDENTITY attribute for the int and bigint data types, whereas other platforms require you to create an independent “sequence generator” object that feeds incrementing values to new rows in the table. These are two different ways to achieve the same thing, and SQL Server’s IDENTITY is arguably simpler to use, but sequence generators offer their own unique advantages as well.
SQL Server 2012 now also supports sequence generators as a powerful alternative to using the IDENTITY ...
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