Another possibility would be to create a functional index on datetime:
CREATE INDEX user_action_date_idx ON user_action (date(datetime));
GREAT!!! I thought it is possible but I didn't knew how to make such indexes. :))
Thank you !!! Andy.
----- Original Message ----- From: "Michael Fuhr" <[EMAIL PROTECTED]>
To: "Andrei Bintintan" <[EMAIL PROTECTED]>
Cc: <pgsql-sql@postgresql.org>
Sent: Thursday, January 20, 2005 11:33 AM
Subject: Re: [SQL] SQL timestamp to date cast
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/
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