Re: Nested Queries

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От Nabil Sayegh
Тема Re: Nested Queries
Дата
Msg-id 3A65956A.91FF5262@sayegh.de
обсуждение исходный текст
Ответ на Nested Queries  (Luke Tudor - RSG <ltt@pml.ac.uk>)
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Luke Tudor - RSG wrote:
>
> Hi,
>
> I seem to have a small problem with my nested queries. Im sure its
> something so simple; If I run each query seperatly, I get the correct
> results and these results can be put into the parent query.
> However if the queries are run together as one nested query the results
> take
> hours and hours (more like days).

FAQ: 4.23) Why are my subqueries using IN so slow?

http://www.postgresql.org/docs/faq-english.html#4.23
(Use EXISTS instead of IN)

--
 Nabil Sayegh
 GPG-Key available at http://www.sayegh.de
 (see http://www.gnupg.org for details)

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