am Fri, dem 14.09.2007, um 10:31:39 +0200 mailte Stanislas de Larocque
folgendes:
> Hi,
>
> I want to optimize my qerry sql (execution time : 2448 ms) :
>
> SELECT b.idxreseller, sum(a.nbrq), b.namereseller from stat a
> ,reseller b where b.asp=6 and a.idxreseller=b.reseller and
> a.month=date_part('month',now() - interval '1 month') and
> a.year=date_part('year',now() - interval '1 month') GROUP BY
> b.idxreseller,b.namereseller limit 15;
Show us the output from EXLAIN ANALYSE <your query>.
My guess: you need at least an index in reseller.asp. Why do you have
columns such a.month and a.year? se a regular DATE or TIMESTAMPTZ field
instead and an index on this.
And use CURRENT_DATE instead now().
Andreas
--
Andreas Kretschmer
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
