From: george young <gry@ll.mit.edu>
To: pgsql-sql@postgresql.org
Subject: select question
Date: Wed, 28 Aug 2002 16:12:41 -0400
Message-ID: <20020828161241.50a8512d.gry@ll.mit.edu> (raw)
[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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To: pgsql-sql@postgresql.org
Cc: gry@ll.mit.edu
Subject: Re: select question
In-Reply-To: <20020828161241.50a8512d.gry@ll.mit.edu>
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