From: Alvaro Herrera <alvherre@commandprompt.com>
To: John Gage <jsmgage@numericable.fr>
Cc: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: How do you do the opposite of regexp_split_to_table?
Date: Tue, 03 Aug 2010 16:35:26 -0400
Message-ID: <1280867576-sup-2555@alvh.no-ip.org> (raw)
In-Reply-To: <4FA8D090-F145-485B-9062-7136CB8B6CB0@numericable.fr>
References: <4FA8D090-F145-485B-9062-7136CB8B6CB0@numericable.fr>
Excerpts from John Gage's message of mar ago 03 16:21:58 -0400 2010:
> Grouping by summing numerical fields seems to be straightforward, but
> grouping by concatenating text fields escapes my search of the
> documentation.
You can create a new custom aggregate function that does this. It's
pretty straightforward. There are examples in the archives (search for
text_concat), but there's also a more modern way involving array_agg and
array_to_string.
--
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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: alvherre@commandprompt.com, jsmgage@numericable.fr
Subject: Re: How do you do the opposite of regexp_split_to_table?
In-Reply-To: <1280867576-sup-2555@alvh.no-ip.org>
* 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