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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

Developing Managed User-Defined Aggregates (UDAs)

A highly specialized feature of SQL Server 2008, managed user-defined aggregates (UDAs) provide the capability to aggregate column data based on user-defined criteria built in to .NET code. You can now extend the (somewhat small) list of aggregate functions usable inside SQL Server to include those you custom-define.

Note

If you’ve been following the examples in this chapter sequentially, at this point, you need to drop the sample table dbo.RegexTest to redeploy the assembly after creating the UDA example.

The implementation contract for a UDA requires the following:

• A static method called Init(), used to initialize any data fields in the struct, particularly the field that contains the aggregated ...

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Publisher Resources

ISBN: 9780768696585Purchase book