On Sunday 20 July 2008, Robert Urban <urban@xxxxxxxxxxxxxxxx> wrote: > 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'; 2. Particularly if you have an index on the day field. Doing text operations on date fields is not conducive to performance. -- Alan
