Re: select, where and null-values (or: select null<>'1' is fuzzy)

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Peter Pilsl <pilsl(at)goldfisch(dot)at>
Cc: postgres mailinglist <pgsql-general(at)postgresql(dot)org>
Subject: Re: select, where and null-values (or: select null<>'1' is fuzzy)
Date: 2001-06-12 18:22:06
Message-ID: Pine.LNX.4.30.0106122021230.756-100000@peter.localdomain
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Peter Pilsl writes:

> manana=# select NULL<>'1';
> ?column?
> ----------
>
> (1 row)
>
> This gives neither true nor false.

It gives NULL. This is correct three-valued Boolean logic.

--
Peter Eisentraut peter_e(at)gmx(dot)net http://funkturm.homeip.net/~peter

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