----- Original Message -----
> > Hi Richard,
> > It is the case.
> > I have found records with NULL's !
> > Exist any docs where I can read more about interpreting of NOT IN ?
>
> There's an item on it in my Postgresql Notes (subqueries and NULLs),
> linked to from
>
> http://techdocs.postgresql.org
>
> You can also read more about it in Bruce's book (also available online
> from the above URL).
>
> Basically, any good relational database book should have a section of the
> meaning of nulls.
And why they shouldn't be allowed in a database. ;-)
Mike Mascari
mascarm@mascari.com
>
> - Richard Huxton
>
