am Sun, dem 20.07.2008, um 20:08:21 +0200 mailte Robert Urban folgendes: > Hi PostgreSQLer, > > if I have a table, the_table, with a DATE field, i'll call it 'day', and > I'd like to find all rows whos day falls within a given month, which of the > following methods is faster/costs less: > > 1. > > SELECT * FROM the_table WHERE day LIKE '2008-01-%'; > > 2. > > SELECT * FROM the_table > WHERE ( day BETWEEN '$month_begin' AND '$month_end' ); > > # where $month_begin is '2008-01-01' and $month_end is '2008-01-31'; Probably the second one, but it depends if you have a propper index. Other solution: create a functional index based on date_trunc and rewrite your where-condition also. Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
