Re: [SQL] NULL

> wieck(at)debis(dot)com (Jan Wieck) writes:
> > I can't see any shift/reduce conflicts if I place a
> > | NULL_P
> > case into the ColConstraintElem: definition right between the
> > | DEFAULT b_expr
> > and
> > | NOT NULL_P
> > cases. Could it be that this reason is out of date?
>
> Could be. I remember tweaking the ColConstraint grammar to avoid
> shift-reduce conflicts with NOT NULL, and it might be that that got
> rid of the problem with NULL as well.
>
> It's still not legal under the SQL92 spec, though, and I'd hate to see
> us give up anything else in order to allow a content-free NULL spec to
> be added...

OK, I assume we are going to dis-allow NULL as a column constraint. We
could allow it but emmit a notice.

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