Am Mittwoch, 13. Juli 2005 15:35 schrieb Tom Lane:
> Janning Vygen <[EMAIL PROTECTED]> writes:
> > this way it works:
> >
> > CREATE TEMP TABLE ranking AS *Q*;
> > EXECUTE 'UPDATE temp_gc SET gc_rank = ranking.rank
> > FROM ranking WHERE temp_gc.mg_name = ranking.mg_name;';
> >
> > and this way it
Janning Vygen <[EMAIL PROTECTED]> writes:
> and this is the combined statement:
>UPDATE temp_gc
> SET gc_rank = ranking.rank
> FROM (
> SELECT
> *,
> ranking(r1.gc_gesamtpunkte, r1.gc_gesamtsiege) AS rank
> FROM (
> SELECT
> mg_name,
> gc_
Janning Vygen <[EMAIL PROTECTED]> writes:
> this way it works:
> CREATE TEMP TABLE ranking AS *Q*;
> EXECUTE 'UPDATE temp_gc SET gc_rank = ranking.rank
> FROM ranking WHERE temp_gc.mg_name = ranking.mg_name;';
> and this way it doesn't:
> UPDATE temp_gc
> SET gc_rank = ranking.rank
> FROM (*Q*)
Hi,
Am Mittwoch, 13. Juli 2005 00:03 schrieb Tom Lane:
> Janning Vygen <[EMAIL PROTECTED]> writes:
> > I have a guess, what happens here: The order of the subselect statement
> > is dropped by the optimizer because the optimizer doesn't see the
> > "side-effect" of the ranking function.
>
> That
Janning Vygen <[EMAIL PROTECTED]> writes:
> I have a guess, what happens here: The order of the subselect statement is
> dropped by the optimizer because the optimizer doesn't see the "side-effect"
> of the ranking function.
That guess is wrong.
I think the problem is that you are trying to upd
Hi,
in postgresql you have several possibilites to get the rank of items. A thread
earlier this year shows correlated subqueries (not very performant) and other
tricks and techniques to solve the ranking problem:
http://archives.postgresql.org/pgsql-general/2005-05/msg00157.php
The possibility
