From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: Merging rows into one result?
Date: Sat, 11 Mar 2006 17:43:37 +0100
Message-ID: <20060311164337.GA19131@KanotixBox> (raw)
In-Reply-To: <20060311173133.1358a018@io.solnet>
References: <20060311173133.1358a018@io.solnet>
Jesper K. Pedersen <jkp@solnet.homeip.net> schrieb:
> Is it possible to use SQL to merge data into one result?
>
> A theorethical example to explain:
>
> tbl_test (
> id integer,
> information varchar(25))
>
> id | information
> ---+--------------
> 1 | Yo
> 2 | Go away
> 1 | Stay put
> 3 | Greetings
>
> Please note id is not unique and not a primary key.
>
> and I wonder if there is any functions to "merge" data (sort of
> concat'ing).
> A normal: select information from tbl_test where id=1
> would result in the rows
> Yo
> Stay put
>
> I would like a single row result in the format of:
> Yo Stay put
Yes, of corse, this is possible. You need a own aggregate-function. A
similar example for this task can you find here:
http://www.zigo.dhs.org/postgresql/#comma_aggregate
I think, it is very simple to rewrite this example for your purpose.
HTH, Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknow)
Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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To: pgsql-sql@postgresql.org
Cc: akretschmer@spamfence.net
Subject: Re: Merging rows into one result?
In-Reply-To: <20060311164337.GA19131@KanotixBox>
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