On 7 Dec 2008, at 19:37, yajiri wrote:
>
> Hi everyone.
>
> I'm trying to SUM the places of the first 5 finishers in a Cross
> Country running event. In a Cross Country race the team score is
> based upon the sum of the top 5 runners on your team. The lowest team
> score at the competition wins.
>
> I have EVENTS(the race), PARTICIPANTS(the runner), and
> EVENT_PARTICIPANTS(a runner in a race).
>
> Within event_participant I have this code, which doesn't work as it
> adds places beyond the 5th runner.
>
> def self.score_5
> self.calculate(:sum, :finish_place, :order
> => :finish_place, :limit => 5)
> end
>
> It appears that the LIMIT is ignored or is applied after the
> summation.
>
It's applied after (so if you did select sum(foo) from bars limit 5
then you'd only get 5 rows back).
Something like
SELECT sum(finish_place) from
(SELECT * from some_table order by finish_place limit 5) as sub_select
should do it.
Fred
> Any suggestions?
>
> >
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