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Re: Surprised at the optimizer...

From: Daniel Morgan <damorgan_at_x.washington.edu>
Date: Sat, 09 Oct 2004 12:45:44 -0700
Message-ID: <1097351229.415912@yasure>


Martijn Tonies wrote:

>>Have you heard of Explain Plan?

>
>
> Yes. But why does a " where proc.procedure_name is null " matter such
> a lot on an _inner join_ where there can be no such rows?
>
> (obviously, I left out that part of the WHERE in my final query).

Because it changes the assumptions made by the optimizer which should be plainly visible with an explain plan.

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace 'x' with 'u' to respond)
Received on Sat Oct 09 2004 - 14:45:44 CDT

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