Skip site navigation (1) Skip section navigation (2)

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: 23230.940955033@sss.pgh.pa.us (view raw or flat)
Thread:
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

pgsql-bugs by date

Next:From: Bruce MomjianDate: 1999-10-26 16:48:05
Subject: Re: [BUGS] (null) != (null) ?
Previous:From: Tom LaneDate: 1999-10-26 15:52:46
Subject: Re: [BUGS] (null) != (null) ?

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group