Re: BOOLEAN data type?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Josh Berkus" <josh(at)agliodbs(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: BOOLEAN data type?
Date: 2001-04-14 18:32:00
Message-ID: 15042.987273120@sss.pgh.pa.us
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"Josh Berkus" <josh(at)agliodbs(dot)com> writes:
> Can someone explain this to me?

Are you taking into account that SQL booleans are actually three-valued?
They can be TRUE, FALSE, or NULL (NULL taken as meaning "don't know").

regards, tom lane

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