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Re: [BUGS] (null) != (null) ?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Todd Vierling <tv(at)pobox(dot)com>
Cc: pgsql-bugs(at)postgreSQL(dot)org
Subject: Re: [BUGS] (null) != (null) ?
Date: 1999-10-26 16:23:53
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
Todd Vierling <tv(at)pobox(dot)com> writes:
> Although I did find a SQL92 document on the web in the amount of time this
> took to copy back to me, and I see the clause about NULL <comp op>
> <anything> being unknown.  Which, I imagine, means "implementation
> dependent".

No.  It means unknown, ie, NULL.  SQL's predicates are three-valued.

			regards, tom lane

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