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

On Tue, 26 Oct 1999, Tom Lane wrote:

: > => select * from foo2 where field not in (select field from foo);

: Well, it falls out of the semantics:  the NOT IN is true if foo2's
: field is not equal to *all* of the entries returned by the subselect.
: If one of those is NULL, then the result of the NOT IN can't be "true",
: it has to be "unknown",

In this case, I suppose I can produce another workaround:

select * from foo where field not in
  (select field from foo2 where field notnull);

which is more wordy, but seems to work as I want.

Thanks for the help!

--
-- Todd Vierling (tv@pobox.com)