On Thu, Mar 22, 2007 at 01:30:35PM +0200, ismo.tuononen@xxxxxxxxxxx wrote:
approximated count????? why? who would need it? where you can use it?
Do a google query. Look at the top of the page, where it says "results N to M of about O". For user interfaces (which is where a lot of this count(*) stuff comes from) you quite likely don't care about the exact count, because the user doesn't really care about the exact count. IIRC, that's basically what you get with the mysql count anyway, since there are corner cases for results in a transaction. Avoiding those cases is why the postgres count takes so long; sometimes that's what's desired and sometimes it is not.
Mike Stone
