Hello, i've got this query that's really slow...
Figure this:
testdb= select now() ; select gid from bs where gid not in ( select x
from z2test ); select now();
now
---
2002-10-09 22:37:21.234627+02
(1 row)
gid
--
lotsa rows
(524 rows)
On Wed, 9 Oct 2002, Magnus Naeslund(f) wrote:
Hello, i've got this query that's really slow...
Figure this:
testdb= select now() ; select gid from bs where gid not in ( select x
from z2test ); select now();
Per FAQ suggestion, try something like
select gid from bs where not exists (select
Magnus Naeslund(f) wrote:
Hello, i've got this query that's really slow...
Figure this:
testdb= select now() ; select gid from bs where gid not in ( select x
from z2test ); select now();
IN (subselect) is notoriously slow (in fact it is an FAQ). Can you rewrite
this as:
select b.gid from
Magnus Naeslund(f) wrote:
Joe Conway [EMAIL PROTECTED] wrote:
IN (subselect) is notoriously slow (in fact it is an FAQ). Can you
rewrite this as:
...
Stephan Szabo [EMAIL PROTECTED] wrote:
Per FAQ suggestion, try something like
...
Thanks alot, below are the results on your
Bruce Momjian [EMAIL PROTECTED] wrote:
We already have a TODO item:
* Allow Subplans to use efficient joins(hash, merge) with upper
variable
Cool.
One thing to note here is that the JOIN query that Joe suggested is both
faster than the subselect thing (no suprise) but also don't care if
Magnus Naeslund(f) wrote:
One thing to note here is that the JOIN query that Joe suggested is both
faster than the subselect thing (no suprise) but also don't care if
z2test has an index on it or not.
It's worth noting though that JOIN is not always the fastest method. I've
found situations
