Re: Performance problem...

On Wed, 2005-03-16 at 07:46, Marcin Giedz wrote:
> Dnia wtorek, 15 marca 2005 18:00, Scott Marlowe napisał:
>
> OK now I know I mys query lasts so long:
>
> SELECT DISTINCT t1.Id, t1.IdTypNazwa, t1.IdFirma, t1.Nazwa, t1.NazwaAscii,
> t1.MskNazwa, t3.Id, t3.numer, t3.MskNumer, t4.Id, t4.numer, t4.MskNumer,
> t5.Id, t5.numer, t5.MskNumer, t6.Id, t6.numer, t6.MskNumer, t7.Id, t7.numer,
> t7.MskNumer, t8.Id, t8.numer, t8.MskNumer, t9.Id, t9.numer, t9.MskNumer,
> t10.Id, t10.IdTypFormaPrawna, t10.MskFormaPrawna, t11.slowo FROM firmy.adres
> AS n INNER JOIN firmy.nazwa AS t1 ON t1.IdFirma = n.IdPodmiot AND
> t1.IdTypNazwa = 153 AND t1.Historia = 0 LEFT JOIN firmy.numer AS t3 ON
> t3.IdPodmiot = t1.IdFirma AND t3.IdTypNumer = 156 AND t3.Historia = 0 LEFT
> JOIN firmy.numer AS t4 ON t4.IdPodmiot = t1.IdFirma AND t4.IdTypNumer = 160
> AND t4.Historia = 0 LEFT JOIN firmy.numer AS t5 ON t5.IdPodmiot = t1.IdFirma
> AND t5.IdTypNumer = 155 AND t5.Historia = 0 LEFT JOIN firmy.numer AS t6 ON
> t6.IdPodmiot = t1.IdFirma AND t6.IdTypNumer = 627 AND t6.Historia = 0 LEFT
> JOIN firmy.numer AS t7 ON t7.IdPodmiot = t1.IdFirma AND t7.IdTypNumer = 848
> AND t7.Historia = 0 LEFT JOIN firmy.numer AS t8 ON t8.IdPodmiot = t1.IdFirma
> AND t8.IdTypNumer = 763 AND t8.Historia = 0 LEFT JOIN firmy.numer AS t9 ON
> t9.IdPodmiot = t1.IdFirma AND t9.IdTypNumer = 762 AND t9.Historia = 0 LEFT
> JOIN firmy.formaprawna AS t10 ON t10.IdFirma = t1.IdFirma LEFT JOIN
> slowniki.tslownik AS t11 ON t11.idslownik = t10.IdTypFormaPrawna AND
> t11.idjezyktyp = 2 WHERE n.Miasto ILIKE 'warszawa%' LIMIT 25
>
> ...because of DISTINCT :D With DISTINCT it tooks about 0,5 minute to search
> several records ..... without DISTINCT (of course a few doubled records
> occured) but query tooks 10ms ;). On the other hand doubled records are
> annoying ..... is it possible to avoid these without changing data in tables?
> Maybe some other query?

Can you enclose the whole query in something like:

select distinct * from (your query here) as a

and see if that helps?