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
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Author: Post, Ethan
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