December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2012 Unleashed
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Ranking Functions
SQL Server 2012 supports four ranking functions: ROW_NUMBER, RANK, DENSE_RANK, and NTILE. These functions allow you to analyze data and provide ranking values to result rows of a query. For example, you might use these ranking functions for assigning sequential integer row IDs to result rows or for presentation, paging, or scoring purposes.
All four ranking functions follow a similar syntax pattern:
function_name() OVER( [PARTITION BY partition_by_list] ORDER BY order_by_list)
The ROW_NUMBER Function
The ROW_NUMBER function allows you to provide sequential integer values to the result rows of a query, based on the order of the rows in the result. The result set must be ordered using an OVER
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