Re: mysterious difference in speed when combining two queries with OR

"Hans Ekbrand" <hans.ekbrand@[EMAIL PROTECTED]
> writes:

> No, I just wanted to show the time differences, I haven't used join
> before. Now that you have adviced me to, I have tried your suggestion
> to rewrite B as a union and it works good! Just as fast as the A Query!

You can even do better. If you know the two sets of mid are disjoint you
can
use UNION ALL. If not you could remove the two DISTINCTs as the UNION will
take care of removing duplicates.

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
  Ask me about EnterpriseDB's On-Demand Production Tuning

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