Обсуждение: partial index + select query performance

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.



--
With Best Regards,
Petchimuthulingam S

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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