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Re: Simply join in PostrgeSQL takes too long - Mailing list pgsql-performance

From Manfred Koizar
Subject Re: Simply join in PostrgeSQL takes too long
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Msg-id lkd29018sbqg8bhcr3dabfjf6u6jckib3t@email.aon.at
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In response to Re: Simply join in PostrgeSQL takes too long  (Rod Taylor <pg@rbt.ca>)
Responses Re: Simply join in PostrgeSQL takes too long
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On Wed, 28 Apr 2004 08:23:35 -0400, Rod Taylor <pg@rbt.ca> wrote:
>The below plpgsql forces the kind of algorithm we wish the planner could
>choose. It should be fairly quick irregardless of dataset.

That reminds me of hash aggregation.  So here's another idea for Vitaly:

    SELECT book_id
      FROM ...
     WHERE ...
     GROUP BY book_id
     LIMIT ...

Servus
 Manfred

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