| From: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: partial index + select query performance |
| Date: | 2008-03-13 07:33:46 |
| Message-ID: | 20080313073346.GC22306@a-kretschmer.de |
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| Lists: | pgsql-performance |
am Thu, dem 13.03.2008, um 12:51:54 +0530 mailte petchimuthu lingam folgendes:
>
> I have created partial index on a field with conditions, if field _a > 200
> and field_a < 300.
>
> I using the select query with condition as field_a in ( 100, 250, 289, ),
>
> Will it use the index.
Why do you ask us, ask your PG, simple type
explain select ... from ... where field_a in ( 100, 250, 289 )
PG shows you the execution plan. But i guess, the index are not used,
because the value 100 are not in the index.
Andreas
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Andreas Kretschmer
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