| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Michael Glaesemann <grzm(at)myrealbox(dot)com> |
| Cc: | CSN <cool_screen_name90001(at)yahoo(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: NULL != text ? |
| Date: | 2005-10-20 14:45:12 |
| Message-ID: | 20051020144512.GA78854@winnie.fuhr.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Thu, Oct 20, 2005 at 03:57:41PM +0900, Michael Glaesemann wrote:
> On Oct 20, 2005, at 15:44 , Michael Fuhr wrote:
> > expression IS DISTINCT FROM expression
> >
> > For non-null inputs this is the same as the <> operator. However,
> > when both inputs are null it will return false, and when just one
> > input is null it will return true. Thus it effectively acts as
> > though null were a normal data value, rather than "unknown".
>
> Interesting! Thanks, Michael. You don't happen to know off the top of
> your head if that's standard SQL, do you?
IS DISTINCT FROM is defined in SQL:1999 and SQL:2003.
--
Michael Fuhr
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