From: Radu-Adrian Popescu <radu.popescu@aldratech.com>
To: pgsql-sql@postgresql.org
Cc: sad@bankir.ru
Subject: Re: feature request ?
Date: Thu, 24 Jun 2004 21:24:57 +0300
Message-ID: <40DB1C79.1000307@aldratech.com> (raw)
In-Reply-To: <20040624174305.GA32506@wolff.to>
References: <71E37EF6B7DCC1499CEA0316A256832801057B7C@loki.wc.globexplorer.net>
<200406241655.26065.sad@bankir.ru>
<20040624065015.Y87012@megazone.bigpanda.com>
<200406241724.14810.sad@bankir.ru>
<20040624072023.H88508@megazone.bigpanda.com>
<20040624174305.GA32506@wolff.to>
Bruno Wolff III wrote:
>
> There already is a syntax like this. You can do:
> CASE boolean_expression
> WHEN TRUE THEN whatever
> WHEN FALSE THEN whatever
> ELSE whatever
> END
>
Besides, sad, there's no such thing as a tri-valued boolean.
You either have a boolean(with a true/false value) or a NULL, which is something
completely different and it's _not_ one of the two _values_ that a boolean
object takes. I think you're looking at this completely wrong. If in Java you
receive a Boolean object instance, will you start claiming that that Java has
tri-valued booleans, and the "if" should account for that ?!
You can think of values in plpgsql as wrapper objects that carry a value and
have a "is_null" flag; I have no idea how they're implemented in PostgreSQL or
in any RDMBS in general but this should do it, at least for a naive implementation.
Peace,
--
Radu-Adrian Popescu
CSA, DBA, Developer
Aldrapay MD
Aldratech Ltd.
+40213212243
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To: pgsql-sql@postgresql.org
Cc: radu.popescu@aldratech.com, sad@bankir.ru
Subject: Re: feature request ?
In-Reply-To: <40DB1C79.1000307@aldratech.com>
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