On Thu, May 10, 2001 at 05:22:07PM -0400, Tom Lane wrote:
> ryan@paymentalliance.net writes:
> > No the query usually returns between 0 and 5 rows. Usually not zero -
> > most often 1.
>
> Ah. You must have a few values that are far more frequent (like tens of
> thousands of occurrences?) and these are throwing off the planner's
> statistics.
I had a similar situation, where I had a lot of rows with 0's in
them. Changing those to NULLs worked wonders. The planner (or
statistics gatherer, or something) apparently takes notice of the
distribution of non-NULL values.
Chris
--
chris@mt.sri.com -----------------------------------------------------
Chris Jones SRI International, Inc.
www.sri.com
