"Peter Childs" <peterachilds@xxxxxxxxx> writes: > My personal reaction is why are you using distinct at all? > > why not > > select id, > min(the_date) as min_date, > max(the_date) as max_date > from my_table group by id; > > Since 8.0 or was it earlier this will use an index should a reasonable one > exist. That's not true for this query. In fact that was precisely the original query he as looking to optimize. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
