RE: possible to do a group by on a time interval? (or some other way to do this)
- From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
- To: <william@xxxxxxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Sun, 14 Oct 2007 07:52:12 -0500
To GROUP BY some time interval, where that interval could vary and is
based on minutes, try something like the following:
SET FEEDBACK off
VARIABLE GROUPBY_MINS NUMBER;
EXEC :GROUPBY_MINS := ??;
VARIABLE MINS_OF_DAY NUMBER;
EXEC :MINS_OF_DAY := :GROUPBY_MINS / 1440;
SET FEEDBACK on
/*
* If the minutes grouping-factor is intra-day (< 1440 minutes), then
* display the date as the middle value of the range. Otherwise,
* display it as the beginning date of the range. So a date of
'01-JAN-2007
* 00:00' and 120 groupby mins would cover 00:00 to 02:00
* and be displayed as '01:00'. If 1440 groupby mins, then it'd be
* displayed as '01-JAN-2007 00:00', meaning values for that whole day.
*/
SELECT CASE
WHEN :GROUPBY_MINS >= 1440 THEN
mytimestamp - ((MOD((mytimestamp - TRUNC(mytimestamp)) *
1440, :GROUPBY_MINS)) / 1440)
ELSE (mytimestamp + :MINS_OF_DAY) - ((MOD((mytimestamp -
TRUNC(mytimestamp)) * 1440, :GROUPBY_MINS)) / 1440) - (:MINS_OF_DAY / 2)
END mytimestamp
FROM metrictable
...
Dave
___________________________________
David C. Herring, DBA | A c x i o m Delivery Center Organization
630-944-4762 office | 630-430-5988 wireless | 630-944-4989 fax
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of William Robertson
> Sent: Saturday, October 13, 2007 12:52 PM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: Re: possible to do a group by on a time interval? (or some
other
> way to do this)
>
> Maybe something like:
>
> SELECT FLOOR(EXTRACT(minute FROM mytimestamp) / 15)*15 AS period
> , COUNT(*)
> FROM metrictable
> GROUP BY FLOOR(EXTRACT(minute FROM mytimestamp) / 15)*15
>
>
> -----Original message-----
> From: ryan_gaffuri@xxxxxxxxxxx
> Date: 10/10/07 23:11
> > seselect max(mytimestamp) as time, sum(mymetric) as bytes
> > from metrictable
> > where mymetric > ( select max(mymetric) from metrictable) - (1/96)
> >
> >
> > "mytimestamp" is a timestamp data type.
> >
> > I want to get a sum for every 15 minute interval in the table. I
will
> add a where clause to limit how far back I want to go. The where
clause I
> have there now is just an example.
> >
> > tried group by, group by rollup, analytic with a window.
> >
> > do i need the model clause? I have never used that. I really do
think
> there is a way to do this in straight sql. Been working on it for a
> while....
> > --
> > //www.freelists.org/webpage/oracle-l
> >
> >
> >
> >
>
> --
> //www.freelists.org/webpage/oracle-l
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