Like functions in programming languages, Microsoft SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set.
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User-Defined Function Basics
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Describes the benefits and components of user-defined functions.
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Types of Functions
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Lists the types of functions and provides references to additional information.
Other Resources
User-Defined Functions (Database Engine)
Designing User-Defined Functions
Implementing User-defined Functions
Help and Information
Getting SQL Server 2008 Assistance