From: Wei Weng <wweng@kencast.com>
To: gry@ll.mit.edu
Cc: pgsql-sql@postgresql.org
Subject: Re: select question
Date: 28 Aug 2002 16:21:31 -0400
Message-ID: <1030566092.24266.1.camel@Monet> (raw)
In-Reply-To: <20020828161241.50a8512d.gry@ll.mit.edu>
References: <20020828161241.50a8512d.gry@ll.mit.edu>
You can use this query
SELECT * FROM T
WHERE run = 'a' AND wafer = 1 AND test = 'foo'
UNION
SELECT * FROM T
WHERE run = 'a' AND wafer = 2 AND test = 'foo'
UNION
SELECT * FROM T
WHERE run = 'a' AND wafer = 3 AND test = 'foo'
UNION
SELECT * FROM T
WHERE run = 'a' AND wafer = 3 AND test = 'bar'
On Wed, 2002-08-28 at 16:12, george young 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?
>
> Puzzled,
> George
>
>
> --
> I cannot think why the whole bed of the ocean is
> not one solid mass of oysters, so prolific they seem. Ah,
> I am wandering! Strange how the brain controls the brain!
> -- Sherlock Holmes in "The Dying Detective"
>
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> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
>
--
Wei Weng
Network Software Engineer
KenCast Inc.
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To: pgsql-sql@postgresql.org
Cc: wweng@kencast.com, gry@ll.mit.edu
Subject: Re: select question
In-Reply-To: <1030566092.24266.1.camel@Monet>
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