Inline Function

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Inline Function

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Jeff Moden SSC Guru Points: 1004363 More actions · Answer 1

Bottom line is, if the function, inline or not, refers to a table, it's a form of RBAR that may have a significant impact on performance whether the execution plan is cached or not.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Jeff Moden SSC Guru Points: 1004363 More actions · Answer 2

In fact... it doesn't even have to refer to a table to be RBAR... and split function based on a While loop is a form of RBAR and performance can be a problem. Of course, you sometimes have no choice because of poor design of the database or the requirements of the necessarily RBAR GUI parameter passed to a proc.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)