From: sad <sad@bankir.ru>
To: Rosser Schwarz <rosser.schwarz@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: feature request ?
Date: Fri, 25 Jun 2004 10:20:41 +0400
Message-ID: <200406251020.41387.sad@bankir.ru> (raw)
In-Reply-To: <37d451f70406242237dce4a8e@mail.gmail.com>
References: <200406250816.47781.sad@bankir.ru>
<37d451f70406242237dce4a8e@mail.gmail.com>
On Friday 25 June 2004 09:37, Rosser Schwarz wrote:
> On Fri, 25 Jun 2004 08:16:47 +0400, sad <sad@bankir.ru> wrote:
> > > Very simply, a boolean may have to values: true or false. It's also
> > > possible that it's not been set to anything (NULL).
> >
> > really ?
> > what about (13 < NULL)::BOOL
>
> Per the semantics of NULL, 13 is neither greater than nor less than
> NULL. NULL is the *unknown* value; it's impossible to meaningfully
> compare it to anything else. Try (NULL = NULL)::boolean. It's NULL,
> also.
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To: pgsql-sql@postgresql.org
Cc: sad@bankir.ru, rosser.schwarz@gmail.com
Subject: Re: feature request ?
In-Reply-To: <200406251020.41387.sad@bankir.ru>
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