From: eric soroos <eric-psql@soroos.net>
To: pgsql-sql@postgresql.org
Subject: Re: select question
Date: Wed, 28 Aug 2002 14:25:17 -0700
Message-ID: <6734364.1181577779@[4.42.179.151]> (raw)
In-Reply-To: <20020828161241.50a8512d.gry@ll.mit.edu>
On Wed, 28 Aug 2002 16:12:41 -0400 in message <20020828161241.50a8512d.gry@ll.mit.edu>, george young <gry@ll.mit.edu> wrote:
> [postgreql 7.2, linux]
> I have a table T with columns run, wafer, and test:
> T(run text, wafer int, test text)
> Given a run and a set of wafers, I need the set of tests that match
> *all* the specified wafers:
>
> run wafer test
> a 1 foo
> a 2 foo
> a 3 foo
> a 3 bar
>
> E.g.
> Given run 'a' and wafers (1,3) I should get one row: foo, since only foo matches both 1 and 3.
> Given run 'a' and wafers (3) I should get two rows: foo,bar, since both foo and bar match 3.
>
> Is there some neat way to do this in a single query?
>
select test from T
where run='a'
and wafers in ('1','3')
group by test
eric
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: eric-psql@soroos.net
Subject: Re: select question
In-Reply-To: <6734364.1181577779@[4.42.179.151]>
* 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