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To: "Jaime Casanova" <el_vigia_ec@hotmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: query with =ALL 
In-reply-to: <BAY8-F35GuluhfJpQPr0002c817@hotmail.com> 
References: <BAY8-F35GuluhfJpQPr0002c817@hotmail.com>
Comments: In-reply-to "Jaime Casanova" <el_vigia_ec@hotmail.com>
	message dated "Mon, 14 Jun 2004 19:07:53 -0000"
Date: Mon, 14 Jun 2004 15:41:40 -0400
Message-ID: <5688.1087242100@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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"Jaime Casanova" <el_vigia_ec@hotmail.com> writes:
> AND
> CPA.cur_paralelo = ALL (SELECT cur_paralelo FROM aca_t_curso ...)

Wait a second ... we are all overthinking the problem.  The subselect
returns three *different* values.  It is not possible for any
CPA.cur_paralelo values to be simultaneously equal to all three.
So this test certainly fails at every row of CPA.

Perhaps you meant "= ANY"?

			regards, tom lane