Re: value from max row in group by

On Thu, Jul 25, 2013 at 10:45 AM, Gary Stainburn <
gary(dot)stainburn(at)ringways(dot)co(dot)uk> wrote:

> Hi folks,
>
> I need help please.
>
> I have a table of trip section details which includes a trip ID, start
> time as
> an offset, and a duration for that section.
>
> I need to extract the full trip duration by adding the highest offset to
> it's
> duration. I can't simply use sum() on the duation as that would not include
> standing time.
>
> Using the data below I would like to get:
>
> 1 | 01:35:00
> 2 | 01:35:00
> 3 | 01:06:00
> 4 | 01:38:00
> 5 | 01:03:00
> 6 | 01:06:00
>

How about using a WINDOW function?

Eg.

select stts_id, total
from (select stts_id, stts_offset+stts_duration as total, row_number() over
(partition by stts_id order by stts_offset desc) as rank from sts) s
where rank = 1
order by stts_id;