On Sun, 2004-08-29 at 15:38, Scott Marlowe wrote:
> On Sun, 2004-08-29 at 15:12, Greg Stark wrote:
> > "Scott Marlowe" <[EMAIL PROTECTED]> writes:
> >
> > > Also, count(*) is likely to always generate a seq scan due to the way
> > > aggregates are implemented currently in pgsql. you might want to try:
> >
> > Huh? I'm curious to know what you're talking about here.
>
> This has been discussed ad infinitum on the lists in the past. And
> explained by better minds than mine, but I'll give it a go.
>
> PostgreSQL has a "generic" aggregate method. Imagine instead doing a
> select count(id1+id2-id3) from table where ...
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that should be avg(id1+id2-id3)... doh
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
