RE: Time Question

From: Post, Ethan <Ethan.Post_at_ps.net>
Date: Thu, 24 Jan 2002 12:49:34 -0800
Message-ID: <F001.003FA6A2.20020124122020@fatcity.com>

Lance,

My performance monitor aggregates frequent samples into smaller tables using this method. I create a function then write a query using the function and pass in the date column. The group by averages the values for me.

CREATE OR REPLACE FUNCTION nearest_even_hour (p_date IN DATE) RETURN DATE AS

l_date DATE;

BEGIN IF MOD(TO_NUMBER(TO_CHAR(TRUNC(p_date, 'HH24'), 'HH24')), 2) = 0 THEN

l_date := TRUNC(p_date, 'HH24'); -- truncate to hour ELSE
l_date := TRUNC(p_date, 'HH24')+1/24; -- round to hour and add one END IF; RETURN l_date;

EXCEPTION
WHEN OTHERS THEN
RAISE; END; insert into SOME_TABLE (

select avg(value), nearest_even_hour(date_column) from OTHER_TABLE
group by nearest_even_hour(date_column));

Ethan

-----Original Message-----
Sent: Thursday, January 24, 2002 12:55 PM To: Multiple recipients of list ORACLE-L

I am not sure how to ask this or if it is even possible. I have a stored procedure that runs every five minutes and writes the data to a table. I want to query every thirty minutes and group the rows from the last half our.

would I used date difference?

Thank you in advance
lance

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Author: Lance Prais
INET: lprais_at_ts.checkpoint.com

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Author: Post, Ethan
INET: Ethan.Post_at_ps.net

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