Re: RES: select on 1milion register = 6s - Mailing list pgsql-performance

On Sat, Jul 28, 2007 at 10:36:16PM +0000, Ragnar wrote:
> On lau, 2007-07-28 at 17:12 -0300, Bruno Rodrigues Siqueira wrote:
>
> > where
> >
> > to_char( data_encerramento ,'yyyy-mm')
> > between   '2006-12' and  '2007-01'
>
> assuming data_encerramento is a date column, try:
> WHERE data_encerramento between   '2006-12-01' and  '2007-01-31'

IMO, much better would be:

WHERE data_encerramento >= '2006-12-01' AND data_encerramento <
'2007-02-01'

This means you don't have to worry about last day of the month or
timestamp precision. In fact, since the field is actually a timestamp,
the between posted above won't work correctly.
--
Decibel!, aka Jim Nasby                        decibel@decibel.org
EnterpriseDB      http://enterprisedb.com      512.569.9461 (cell)