On Fri, Oct 28, 2005 at 03:40:40PM -0700, Roger Hand wrote:
> You're first joining against the entire user table, then filtering out the users
> you don't need.
That's just wrong, sorry -- the planner is perfectly able to push the WHERE
down before the join.
I'd guess the problem is the age() query; age() doesn't really return what
you'd expect, and I don't think it can use an index easily (I might be wrong
here, though). Instead, try something like
WHERE u.joined_date >= current_date - interval '30 days'
except that if you're running pre-8.0, you might want to precalculate the
right-hand side on the client.
I couldn't see EXPLAIN ANALYZE of your query, BTW -- having it would be
useful.
/* Steinar */
--
Homepage: http://www.sesse.net/
