On Thu, Aug 14, 2008 at 15:30, Peter Eisentraut <peter_e@gmx.net> wrote:
> Am Thursday, 14. August 2008 schrieb Dmitry Teslenko:
>> SELECT SUM(...) FROM table1 WHERE field3 = 'ABC' AND field1 <> 1
>> GROUP BY field2
>>
>> And planner picks up a sequential scan of a table. Why does he?
>
> Presumably because it thinks it is the best plan, and I see no reason to doubt
> that outright. You might get better performance with an index on field3.
>
Why then idx2 on field1 and field3 don't help here?
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