Re: [HACKERS] Subselects and NOTs

> 
> > Added to TODO.
> > > ... In Postgres, a column can be
> > > designated "not null", the default being to allow nulls.  In the
> > > default Sybase configuration, it is the other way around.  In the
> > > interest of writing cross database compatible code, I try to always
> > > call out columns as either "null" (nulls allowed), or "not null"
> > > (nulls not allowed).  Unfortunately, Postgres does not support this
> > > In short, it would be nice if Postgres would take "null" as a type
> > > specifier as well as "not null".
> 
> We currently get a shift/reduce parsing conflict on this since NULL can be
> specified in other constraint clauses and since the constraint clauses are
> only whitespace delimited. It might be that this part of the parser can be
> redone, or perhaps the only way around is to restrict the ordering of the
> constraints. But NULL constraint is not SQL92 and free ordering is...

OK, removed from TODO.

-- 
Bruce Momjian
maillist@candle.pha.pa.us