Subject: Re: Joining several rows into only one
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From: "Jonathan S. Katz" <jonathan.katz@excoventures.com>
In-Reply-To: 
 <CAAY=A79L1zaxcSoCUzssHogoezEneWA=ZUEu3veHLk86K-EG_g@mail.gmail.com>
Date: Wed, 28 Nov 2012 13:37:01 -0500
Cc: pgsql-sql@postgresql.org
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Message-Id: <5F7A236E-DB07-4583-8492-2CAB3720FBA3@excoventures.com>
References: 
 <CAAY=A79L1zaxcSoCUzssHogoezEneWA=ZUEu3veHLk86K-EG_g@mail.gmail.com>
To: JORGE MALDONADO <jorgemal1960@gmail.com>
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Sender: pgsql-sql-owner@postgresql.org

On Nov 28, 2012, at 1:33 PM, JORGE MALDONADO wrote:

> I have a SELECT statement that gives me a result like this:
>=20
> SONG     ARTIST
> -----------------------------------
> Song1      Artist1
> Song1      Artist2
> Song1      Artist3
> Song2      Artist2
> Song3      Artist4
> Song4      Artist1
> Song5      Artist4
>=20
> As you can see, the same song may belong to more than one artist, and thi=
s is fine. What I would like to do is NOT to get several rows, one for each=
 different artist, but to join all of the artists in one column and display=
 only one row.
> Is this possible?

Hi Jorge,

Try the array_agg function:

	SELECT song, array_agg(artist)
	FROM table
	GROUP BY song;

Best,

Jonathan


--=20
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