https://www.icyphoenix.com/viewtopic.php?f=26&t=8358&p=55143#p55143
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Informpro
Sun 05 Feb, 2012 21:28

Re: Exclude Banned Calendar Bdays?
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There's actually too many way to achieve that. If you can run EXPLAIN on these queries, you'll have a better idea of the performance impact. You could also select in before (=> (SELECT bla FROM ...) as B), etc, etc.


