From: Dan Winslow <danwinslow@cox.net>
To: pgsql-sql@postgresql.org
Subject: Seeking help with a query....
Date: Fri, 21 Mar 2003 15:51:40 GMT
Message-ID: <gyGea.116460$JE5.71106@news2.central.cox.net> (raw)
Hi folks, seeking help with a query that I thought was simple, but
apparantly isn't, at least for someone with my knowledge level.
Given a table :
create table atable (
code1 char,
code2 char,
cost int
);
And the rows
code1 code2 cost
-----------------------------
a b 2
d e 4
b a 6
f g 1
I need a ( preferably single ) query that will sum the costs for any
matching pairs of codes regardless of order. That is, row 1 and row 3
concern the same pair of unordered codes (a,b), and the result should show
that the (a,b) pair had a summed cost of 8. I am not able to change any of
the environment or preconditions other than the query itself. I have tried
so many approaches that they aren't even worth listing. Any suggestions
would be very much appreciated.
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To: pgsql-sql@postgresql.org
Cc: danwinslow@cox.net
Subject: Re: Seeking help with a query....
In-Reply-To: <gyGea.116460$JE5.71106@news2.central.cox.net>
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