Hello All,

SELECT notification_time, finished_time, sum(finished_time -
notification_time) as actual
FROM log
GROUP BY notification_time, finished_time;

gives me:

notification_time | finished_time | actual
------------------------+------------------------+-----------------
2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 2 days 15:20:00
2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 1 day 18:50:00


How can write a query to calculate the duration using custom work
hours which is Monday 7am / Friday 5pm?

The result I'm expecting for the above to be

notification_time | finished_time | actual
------------------------+------------------------+-----------------
2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 00:20:00
2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 00:20:00

Thanks.

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correction:

> The result I'm expecting for the above to be
>
> notification_time | finished_time | actual
> ------------------------+------------------------+-----------------
2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 01:20:00
> 2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 00:20:00
>

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TIP 3: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faq

am Wed, dem 05.09.2007, um 13:45:46 +1000 mailte novice folgendes:
> Hello All,
>
> SELECT notification_time, finished_time, sum(finished_time -
> notification_time) as actual
> FROM log
> GROUP BY notification_time, finished_time;
>
> gives me:
>
> notification_time | finished_time | actual
> ------------------------+------------------------+-----------------
> 2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 2 days 15:20:00
> 2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 1 day 18:50:00
>
>
> How can write a query to calculate the duration using custom work
> hours which is Monday 7am / Friday 5pm?
>
> The result I'm expecting for the above to be
>
> notification_time | finished_time | actual
> ------------------------+------------------------+-----------------
> 2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 00:20:00
> 2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 00:20:00

You can write a function. Calculate for every day between
notification_time and finished_time this timestamps for every day. I
mean, for instance your first row:


2007-07-06 15:50:00+10 2007-07-07 00:00:00+10
2007-07-07 00:00:00+10 2007-07-08 00:00:00+10
2007-07-08 00:00:00+10 2007-07-09 00:00:00+10
2007-07-09 00:00:00+10 2007-07-09 07:20:00+10

Now check, if the first timestamp are a working day (select
extract('dow' from '2007-07-06 15:50:00+10'::timestamptz)). If so, than
calculate the working-time and adds all.

A little function for you:

<--- cut
create or replace function intersect_time (IN start timestamptz, IN stop timestamptz, IN w_start timestamptz, IN w_end timestamptz, OUT duration interval) as $$
declare
_s1 alias for $1;
_e1 alias for $2;
_s2 alias for $3;
_e2 alias for $4;
_start timestamptz;
_end timestamptz;

begin

if _s1 < _s2 then
_start := _s2;
else
_start := _s1;
end if;

if _e1 < _e2 then
_end := _e1;
else
_end := _e2;
end if;

if _start < _end then
duration := _end - _start;
else
duration := '0'::interval;
end if;

return;

end;
$$language plpgsql;

--- cut

A simple test:

Only the first and the last are working days, so we call the function
for this rows:


test=*# select intersect_time('2007-07-06 15:50:00+10'::timestamptz,'2007-07-07 00:00:00+10'::timestamptz, '2007-07-06 07:00:00+10'::timestamptz, '2007-07-06 17:00:00+10'::timestamptz);
intersect_time
----------------
01:10:00
(1 row)

test=*# select intersect_time('2007-07-09 00:00:00+10'::timestamptz,'2007-07-09 07:10:00+10'::timestamptz, '2007-07-09 07:00:00+10'::timestamptz, '2007-07-09 17:00:00+10'::timestamptz);
intersect_time
----------------
00:10:00
(1 row)


test=*# select '01:10:00'::interval + '00:10:00'::interval;
?column?
----------
01:20:00
(1 row)



Hope that helps, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net

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TIP 2: Don't 'kill -9' the postmaster

On 07/09/2007, Filip Rembiałkowski <plk.zuber@gmail.com> wrote:
> 2007/9/5, Raj A <raj.ayappan@gmail.com>:
> > correction:
> >
> > > The result I'm expecting for the above to be
> > >
> > > notification_time | finished_time | actual
> > > ------------------------+------------------------+-----------------
> > > 2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 01:20:00
> > > 2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 00:20:00
>
> Could you please show the data structures ( create table commmands +
> ane constraints you have )?
>
> If you do this, you have much bigger chance of getting an answer

sure

create table log
(
id integer PRIMARY KEY,
notification_time timestamp with time zone,
finished_time timestamp with time zone
);

INSERT INTO log values (1, '2007-07-06 15:50', '2007-07-09 07:10');
INSERT INTO log values (2, '2007-07-07 12:30', '2007-07-09 07:20');

SELECT notification_time, finished_time, sum(finished_time -
notification_time) as actual
FROM log
GROUP BY notification_time, finished_time;

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