On Tue, May 17, 2016 at 12:04 AM, Guyren Howe <guy...@gmail.com> wrote:
> On May 16, 2016, at 20:48 , David G. Johnston <david.g.johns...@gmail.com> > wrote: > > > On Monday, May 16, 2016, Guyren Howe <guy...@gmail.com> wrote: > >> I have this SELECT clause as part of a larger query: >> >> FIRST_VALUE(drs.id) OVER (PARTITION BY drs.order_ID ORDER BY drs.position >> ASC) AS current_drs_id >> >> Seems reasonable to me: group and sort the fields in this table and give >> me the first value. >> >> But I get "column "drs.id" must appear in the GROUP BY clause or be used >> in an aggregate function". >> >> Huh? >> > > The larger query would help… > > > SELECT > o.id, > os.status AS status, > o.status_updated_at, > o.should_hold_at_airlines, > (SELECT drs2.id FROM delivery_route_segments drs2 WHERE drs2.order_id = > o.id AND NOT drs2.completed ORDER BY drs2.position LIMIT 1) AS current_drs_id, > > > FROM > orders o JOIN > order_statuses os ON (o.status = os.id) JOIN > delivery_route_segments drs ON (drs.order_id = o.id) JOIN > pick_up_addresses pua ON (pua.order_id = o.id) > GROUP BY > o.id, os.status > > I would prefer to do the subquery as a window function, both because that > is cleaner to read and also because I believe it is likely to be more > efficient. > > This query is non-functional. It has a GROUP BY without any aggregate functions and not all of the selected columns are in the group by. David J.
