From: wstrzalka <wstrzalka@gmail.com>
To: pgsql-sql@postgresql.org
Subject: ordered by join? ranked aggregate? how to?
Date: Mon, 14 Sep 2009 07:25:33 -0700 (PDT)
Message-ID: <d7867e26-d5de-4c48-bfac-d6f266b47ec6@l34g2000vba.googlegroups.com> (raw)
What I need is to join 2 tables
CREATE TABLE master(
id INT4
);
CREATE TABLE slave (
master_id INT4,
rank INT4,
value TEXT);
What I need is to make the query:
SELECT m.id, array_agg(s.value) AS my_problematic_array
FROM master AS m LEFT JOIN slave AS s ON (m.id = s.master_id)
GROUP BY m.id;
return the 'my_problematic_array' in order specified by slave.rank
As you probably can guest I don't have any idea know how to do it :/
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: wstrzalka@gmail.com
Subject: Re: ordered by join? ranked aggregate? how to?
In-Reply-To: <d7867e26-d5de-4c48-bfac-d6f266b47ec6@l34g2000vba.googlegroups.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox