Message-ID: <3DEBBA62.CFFE0F34@nsd.ca>
Date: Mon, 02 Dec 2002 14:54:10 -0500
From: Jean-Luc Lachance <jllachan@nsd.ca>
MIME-Version: 1.0
To: Dennis =?iso-8859-1?Q?Bj=F6rklund?= <db@zigo.dhs.org>
Cc: Sergio Oshiro <smoshiro@hotmail.com>, pgsql-sql@postgresql.org
Subject: Re: Min and Max
References: <Pine.LNX.4.44.0212021939410.9578-100000@zigo.dhs.org>
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If you do not mind non standard, how about:

SELECT DISTINCT ON(id_father) * FROM children ORDER BY id_father,
child_age;


Dennis Bj=F6rklund wrote:
>=20
> On 29 Nov 2002, Sergio Oshiro wrote:
>=20
> > How can I get the rows of the children name and its "father" such that
> > they have the min child_ages?
> >
> > -- the following does not return the child_name...
> > select id_father, min(child_age) from children group by id_father;
> > select id_father, max(child_age) from children group by id_father;
>=20
> You could join one of the above with the table itself and get the result.
> Something like
>=20
> select *
>   from (  select id_father, min(child_age)
>             from children
>         group by id_father) as r,
>         children
>  where children.id_father =3D r.id_father
>    and children.min =3D r.min;
>=20
> --
> /Dennis
>=20
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