On Thu, Jan 20, 2005 at 10:52:50AM +0200, Andrei Bintintan wrote: > SELECT DISTINCT(nummer) > FROM user_action > WHERE datetime::date='11/11/2004' AND id_action IN (5,6,9) > > Now, datetime has the type timestamp. How can I make an index or write > different this query so that it runs faster?
You could create an index on datetime and rewrite your queries: CREATE INDEX user_action_datetime_idx ON user_action (datetime); SELECT DISTINCT(nummer) FROM user_action WHERE datetime >= '11/11/2004' AND datetime < '11/12/2004' AND id_action IN (5,6,9); Another possibility would be to create a functional index on datetime: CREATE INDEX user_action_date_idx ON user_action (date(datetime)); SELECT DISTINCT(nummer) FROM user_action WHERE date(datetime) = '11/11/2004' AND id_action IN (5,6,9); -- Michael Fuhr http://www.fuhr.org/~mfuhr/ ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
