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  3. April 2009

Re: Newbie SQL problem with UPDATE - SQL0811

I normally don't argue with Elvis about SQL performance but....

If most rows have a match, wouldn't COALESCE perform better?

On the other hand, if most rows don't have a match, I could see EXISTS
performing better as long as the right index exists.

Charles

On Fri, Apr 10, 2009 at 3:16 PM, Elvis Budimlic
<ebudimlic@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

BTW, for performance reasons, stick with the EXISTS and forget the COALESCE
in this case.


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