Re: Need help to decide Mysql vs Postgres - Mailing list pgsql-performance

On Mon, Jun 06, 2005 at 08:25:08PM +0300, Tobias Brox wrote:
> [Jeffrey Tenny - Mon at 11:51:22AM -0400]
> > There are some pitfalls to pgsql though, especially for existing SQL
> > code using MAX and some other things which can really be blindsided
> > (performance-wise) by pgsql if you don't use the workarounds.
>
> Yes, I discovered that - "select max(num_attr)" does a full table scan even
> if the figure can be found easily through an index.

PostgreSQL 8.1 will be able to use indexes for MIN and MAX.

http://archives.postgresql.org/pgsql-committers/2005-04/msg00163.php
http://archives.postgresql.org/pgsql-committers/2005-04/msg00168.php

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/