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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

The grouping_id() Function

The grouping_id() function, new in SQL Server 2008, can be used to determine the level of grouping in a query using GROUPING SETS or the CUBE and ROLLUP operators. Unlike the GROUPING() function, which takes only a single column expression as an argument and returns a 1 or 0 to indicate whether that individual column is being aggregated, the grouping_id() function accepts multiple column expressions and returns a bitmap to indicate which columns are being aggregated for that row.

For example, you can add the grouping_id() and grouping() functions to the query in Listing 42.4 and examine the results (see Listing 42.5).

Listing 42.5 Using the grouping_id() Function

Unlike the grouping() function, which takes only a ...

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Publisher Resources

ISBN: 9780768696585Purchase book