From: Tom Lane <tgl@sss.pgh.pa.us>
To: db@ke5in.com
Cc: pgsql-sql@postgresql.org
Subject: Re: find the "missing" rows
Date: Wed, 01 Dec 2004 20:53:11 -0500
Message-ID: <28993.1101952391@sss.pgh.pa.us> (raw)
In-Reply-To: <33080.67.87.27.161.1101915810.squirrel@www.ke5in.com>
References: <33080.67.87.27.161.1101915810.squirrel@www.ke5in.com>
"Kevin B." <db@ke5in.com> writes:
> Select a.i, b.i
> from t as a
> left join t as b on a.i = b.i
> where a.n = 'a' and b.n = 'b' and b.i is null
This can't succeed since the b.n = 'b' condition is guaranteed to fail
when b.* is nulled out ...
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, db@ke5in.com
Subject: Re: find the "missing" rows
In-Reply-To: <28993.1101952391@sss.pgh.pa.us>
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