On Fri, May 3, 2024 at 2:47 PM Laurenz Albe <laurenz.a...@cybertec.at> wrote: > > On Thu, 2024-05-02 at 08:23 -0700, David G. Johnston wrote: > > Version 2 attached. Still a draft, focused on topic picking and overall > > structure. > > I'm fine with most of the material (ignoring ellipses and typos), except this: > > + The NOT NULL column constraint is largely syntax sugar for the > corresponding > + column IS NOT NULL check constraint, though there are metadata > differences > + described in create table. >
the system does not translate (check constraint column IS NOT NULL) to NOT NULL constraint, at least in domain. for example: create domain connotnull integer; alter domain connotnull add not null; \dD connotnull drop domain connotnull cascade; create domain connotnull integer; alter domain connotnull add check (value is not null); \dD
