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Re: [BUGS] (null) != (null) ? - Mailing list pgsql-bugs

From Tom Lane
Subject Re: [BUGS] (null) != (null) ?
Date
Msg-id 23230.940955033@sss.pgh.pa.us
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In response to Re: [BUGS] (null) != (null) ?  (Todd Vierling <tv@pobox.com>)
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Todd Vierling <tv@pobox.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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