December 2001
Intermediate to advanced
800 pages
17h 55m
English
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Chapter 10. User-Defined Functions
Great designers have a relentless desire to create—to make things.
—Steve McConnell[1]
[1] McConnell, Steve. After the Gold Rush. Redmond, WA:Microsoft Press, 1999.
A UDF is a special type of subroutine that can be used in expressions. UDFs are very much like Transact-SQL's built-in functions—you pass them the parameters they require and they return a result of some type.
UDFs come in three varieties: scalar functions, multistatement table-valued functions, and inline table-valued functions. A scalar function is one that returns a single value. It can be used in expressions just like regular system functions. A multistatement table-valued function (what I'll usually just refer to as a table-valued function ...
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