From: Tom Lane <tgl@sss.pgh.pa.us>
To: josh@agliodbs.com
Cc: pgsql-sql@postgresql.org
Subject: Re: BOOLEAN question
Date: Tue, 29 Oct 2002 13:27:34 -0500
Message-ID: <22789.1035916054@sss.pgh.pa.us> (raw)
In-Reply-To: <200210281706.39015.josh@agliodbs.com>
References: <200210281706.39015.josh@agliodbs.com>
Josh Berkus <josh@agliodbs.com> writes:
> Odd question: I have a query that returns a set of none to several rows. One
> column in these rows is BOOLEAN. I want the query to return:
> 1) TRUE if *any* of the BOOLEAN values is TRUE;
> 2) FALSE if *all* of the BOOLEAN values are FALSE;
> 3) FALSE or NULL if no rows are returned.
Perhaps
SELECT true = ANY (SELECT boolcol FROM ...);
or
SELECT true IN (SELECT boolcol FROM ...);
Which is not to say that MAX(bool) might not be a nicer solution;
but you can definitely do it with SQL-spec constructs.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, josh@agliodbs.com
Subject: Re: BOOLEAN question
In-Reply-To: <22789.1035916054@sss.pgh.pa.us>
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