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From: Pavel Stehule <pavel.stehule@gmail.com>
Date: Tue, 8 Feb 2011 20:43:19 +0100
Message-ID: <AANLkTimZi_ouNUm8EOyL8RmL5Op-TQwfTwJ4_4NQspFF@mail.gmail.com>
Subject: Re: "select c1, method(c2) group by c1" returns all values of
	c2 for c1
To: emilu@encs.concordia.ca
Cc: pgsql-sql@postgresql.org
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Hello

you can use a string%agg function if you have a 9.0. On older version
there is a array_agg function

select c1, array_to_string(array_agg(c2),',') from T1 group by c1

regards

Pavel Stehule

2011/2/8 Emi Lu <emilu@encs.concordia.ca>:
> Good afternoon,
>
> Is there a method to retrieve the following results:
>
> T1(c1 int, c2 varchar(128) )
> ---------------------------------
>
>
> (1, val1);
> (1, val2);
> (1, val3);
> (2, val1);
> (3, val5);
> (3, val6);
>
> select c1, method(c2)
> group by c1
>
> returns:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 1, =C2=A0 "val1, val2, val3"
> 2, =C2=A0 "val1"
> 3, =C2=A0 "val5, val6"
>
>
> Thanks a lot!
>
> --
> Lu Ying
>
> --
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