From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: Dag-Erling Smørgrav <des@des.no>
Cc: pgsql-sql@postgresql.org
Subject: Re: Existential quantifier
Date: Fri, 9 Oct 2009 17:26:20 -0700 (PDT)
Message-ID: <20091009172456.C81911@megazone.bigpanda.com> (raw)
In-Reply-To: <86vdiop1hu.fsf@ds4.des.no>
References: <86bpkgqiv8.fsf@ds4.des.no>
<20091009160318.J80119@megazone.bigpanda.com>
<86vdiop1hu.fsf@ds4.des.no>
On Sat, 10 Oct 2009, [utf-8] Dag-Erling Smørgrav wrote:
> Stephan Szabo <sszabo@megazone.bigpanda.com> writes:
> > Not at all tested as I don't have access to my db right now, but I think
> > something like one of these would work:
> >
> > select fs.film.title, fs.film.year
> > from fs.film
> > where exists(select 1 from fs.star where fs.film.id = fs.star.film
> > and fs.star.last = 'Sheen');
>
> Ah, that was exactly what I was looking for.
>
> > select fs.film.title, fs.film.year
> > from fs.film
> > where fs.film.id in (select fs.star.film where fs.star.last = 'Sheen');
>
> ITYM
>
> select fs.film.title, fs.film.year
> from fs.film
> where fs.film.id in (
> select fs.star.film from fs.star where fs.star.last = 'Sheen'
> );
>
> (missing FROM)
Yeah, that'd be necessary. You might want to try them on a realistic data
set to see how the various options are planned.
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: sszabo@megazone.bigpanda.com, des@des.no
Subject: Re: Existential quantifier
In-Reply-To: <20091009172456.C81911@megazone.bigpanda.com>
* 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