| From: | Sean Davis <sdavis2(at)mail(dot)nih(dot)gov> |
|---|---|
| To: | pgsql-novice(at)postgresql(dot)org, henlin(at)yandex(dot)ru |
| Subject: | Re: indexed aggregates? |
| Date: | 2007-03-26 19:16:38 |
| Message-ID: | 200703261516.38180.sdavis2@mail.nih.gov |
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| Lists: | pgsql-novice |
On Monday 26 March 2007 14:39, henlin wrote:
> hi.
>
> Is were any way to make aggregates work faster? Like some kind of indexes?
>
> as for example "SELECT a,sum(b) FROM c GROUP BY a;"
>
> The only thing come to my mind is tmp tables && triggers && some kind of
> functions (not sure, which and how).
You could certainly put a trigger on table c that inserts or updates values in
another table and then use that for lookups of sums. It wouldn't be a very
general solution (you need to know ahead of time what aggregates you want to
query), but it might satisfy your needs.
Sean
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