From: Michael Fuhr <mike@fuhr.org>
To: M.D.G. Lange <mlange@dltmedia.nl>
Cc: pgsql-sql@postgresql.org
Subject: Re: Function does not return, but gives error..
Date: Thu, 16 Jun 2005 06:47:08 -0600
Message-ID: <20050616124708.GA65633@winnie.fuhr.org> (raw)
In-Reply-To: <42B16FFF.8050009@dltmedia.nl>
References: <42B16FFF.8050009@dltmedia.nl>
On Thu, Jun 16, 2005 at 02:26:39PM +0200, M.D.G. Lange wrote:
>
> IF groupres = NULL
> THEN
> ...
> END IF;
> is not trapped...
Be sure to understand how NULL works in comparisons:
http://www.postgresql.org/docs/8.0/static/functions-comparison.html
SELECT NULL = NULL;
?column?
----------
(1 row)
SELECT (NULL = NULL) IS TRUE;
?column?
----------
f
(1 row)
SELECT (NULL = NULL) IS FALSE;
?column?
----------
f
(1 row)
SELECT (NULL = NULL) IS NULL;
?column?
----------
t
(1 row)
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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To: pgsql-sql@postgresql.org
Cc: mike@fuhr.org, mlange@dltmedia.nl
Subject: Re: Function does not return, but gives error..
In-Reply-To: <20050616124708.GA65633@winnie.fuhr.org>
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