From: Gary Stainburn <gary.stainburn@ringways.co.uk>
To: PostgreSQL-sql <pgsql-sql@postgresql.org>
Subject: sub-sel/group problem
Date: Mon, 11 Aug 2003 11:24:07 +0100
Message-ID: <200308111124.07832.gary.stainburn@ringways.co.uk> (raw)
Hi folks,
I don;t know if it's cos it's Monday or what, but I can't see what's wrong
here.
I've got two tables, turns which holds a turn number, a task, and where
appropriate a link to a loco. The select below works but only shows those
tasks where a loco is involved.:
select r.rtid, concat(r.rcid::text || ' on ' || l.lnumber::text) as task
from rides r, loco_dets l where r.rlid = l.lid group by rtid;
rtid | task
------+---------------------------------------------
5 | G on 60007
6 | A on 75014, C on 75014, A on 75029, C on 75029
7 | C on 4277, A on 44767, C on 44767
8 | A on 30926, C on 30926, G on 60532
9 | A on 30926, C on 30926, A on 75014, C on 75014
10 | F on 2392, F on 75029, L on 75029
11 | A on 44767, C on 44767, A on 75029
However, when I tried to change this to using an outer join I'm getting stuck.
Can anyone see my stumbling point, which I think is to do with the condition
part of the case statement. Do I need to do that in a sub-select first or is
there an alternative?
=# select r.rtid,
-# case when r.rlid > 0 then
-# concat(r.rcid::text || ' on ' || l.lnumber::text)
-# else
-# r.rcid::text
-# end as task
-# from rides r
-# left outer join loco_dets l on r.rlid = l.lid
-# group by rtid
-# order by rtid
-# ;
ERROR: Attribute r.rlid must be GROUPed or used in an aggregate function
=#
--
Gary Stainburn
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To: pgsql-sql@postgresql.org
Cc: gary.stainburn@ringways.co.uk
Subject: Re: sub-sel/group problem
In-Reply-To: <200308111124.07832.gary.stainburn@ringways.co.uk>
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