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From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Navrátil, Ondřej <onavratil@monetplus.cz>
Cc: Peter Eisentraut <peter@eisentraut.org>
Cc: pgsql-docs@lists.postgresql.org
Subject: Re: COALESCE documentation
Date: Wed, 03 Jul 2024 16:41:19 +0200
Message-ID: <d67def4741aec22bb16a10fb7dcbae4086daf125.camel@cybertec.at> (raw)
In-Reply-To: <CAEELDapPJegiMP4O4QsC7vWeCAyjNiH7zj46HsNkuvXGwvwTdA@mail.gmail.com>
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	<62f888dc-1ee5-48cf-b76c-6a75dcfa8b10@eisentraut.org>
	<0c98e0da0df5780f05e3eb598bb84955450a74f8.camel@cybertec.at>
	<CAEELDapPJegiMP4O4QsC7vWeCAyjNiH7zj46HsNkuvXGwvwTdA@mail.gmail.com>

On Wed, 2024-07-03 at 11:42 +0200, Navrátil, Ondřej wrote:
> On a side note, I tested similar behavior in Oracle databases, and for them, something like 
> select testtype(null, null) is null; -- returns 0 (false)
> select testtype(null, null) is not null; -- returns 1 (true)
> ...and as far as I could test, in Oracle the IS NULL and IS NOT NULL operators are truly dual

That only goes to say that Oracle is not very standard compliant, but
I wouldn't expect anything else from a system where '' IS NULL.

Yours,
Laurenz Albe





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