RE: how to avoid duplicate business logic

SSC Guru

Points: 186127

October 2, 2012 at 7:00 am

norbert.manyi (10/2/2012)
...Ps. I understand that this particular example can be done using views, but I'm taking about the situations where you cannot do this. (I just can't find a good example right now)

Views would be a better option than functions - coded properly they won't hammer performance quite like the suggested UDF. You can't find a good example right now - if you still can't find one in an hour, would it matter to you if there was the odd documented exception to the rule?

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden