Re: Query takes much to long, is there a work around?

Found it,

I now use

SELECT adreslog.adres,adreslog.totalread
,sum(case when linkcode='1012' AND linklog.adrescode=adreslog.alogid then 1
else 0 end ) as Homepage
,sum(case when linkcode='1234' AND linklog.adrescode=adreslog.alogid then 1
else 0 end ) as Mickey

FROM adreslog left join linklog on (adreslog.alogid = linklog.adrescode)

WHERE adreslog.mailcode='24120256'
group by adreslog.adres,adreslog.totalread;

Your comment about joining the tables helped.

Thanks !!

Kind regards,
Toon van Doorn

-----Oorspronkelijk bericht-----
Van: pgsql-php-owner(at)postgresql(dot)org [mailto:pgsql-php-owner(at)postgresql(dot)org]
Namens Frank Bax
Verzonden: dinsdag 4 oktober 2005 14:19
Aan: pgsql-php(at)postgresql(dot)org
Onderwerp: Re: [PHP] Query takes much to long, is there a work around?

At 07:55 AM 10/4/05, Toon van Doorn wrote:
>Is there a faster way of selecting the hits on a link per adres?

This type of question (slow query) is usually asked on pgsql-sql list, it
has nothing to do with php.

You didn't mention indexes - surely you have indexes on your tables?

Check the output of "EXPLAIN ANALYSE" for one of your "select count ..."
subqueries.

I think your query will benefit from a multi-column index on ( mailcode,
linkcode, adrescode ), but 16 subselects and 51 rows in adreslog means over
800 subqueries being executed - that's a lot of work to do!!

What happens if you change
SELECT count(linkcode) FROM linklog WHERE linklog.mailcode='24120256' AND
linkcode='1012' AND linklog.adrescode=adreslog.alogid) as Homepage to
somthing like:
SELECT adrescode, mailcode, count(linkcode) FROM linklog WHERE
mailcode='24120256' AND linkcode='1012' as Homepage

then join to adreslog table.

---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faq