Avoid function execution when parameters are null

There is a specific syntax TSQL provides for skipping function execution when any parameters are NULL.  This often cleans-up code that would otherwise have to use branching logic to avoid the execution.  Fast, simple, and handy.

CREATE FUNCTION dbo.fMyFunction
(
   @MyParm1    nvarchar(max)
  ,@MyParm2    datetimeoffset
) returns bit
with returns null on null input

(Available on SQL 2005 and later)

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About tim.edlund

Tim Edlund founded Softworks Group Inc. in 1990. As CEO, Tim is responsible for setting strategy and leading product R&D. Tim has maintained expertise in database technologies and is an Agile methodology evangelist. He also enjoys staying fit , skiing and trying to survive parenting teenagers.
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