Re: Changing column modifiers?

ALTER TABLE authors ADD CHECK (NOT authorfirstname = NULL);
Should that be:
ALTER TABLE authors ADD CHECK (NOT authorfirstname IS NULL);
?
Anyway, how about something like the following:
UPDATE pg_attribute SET attnotnull='t' WHERE attname='field_name' AND
attrelid in (SELECT pg_class.oid FROM pg_class WHERE relkind='r' AND
relname='table_name');
Where field_name is the field name and table_name is the table name.
Hope this helps,
- Stuart

> -----Original Message-----
> From:    Arne Weiner [SMTP:aswr@gmx.de]
> Sent:    Monday, September 10, 2001 10:06 AM
> To:    pgsql-admin@postgresql.org
> Subject:    Re: Changing column modifiers?
>
>
> It seems that it is not possible to alter column constraints and
> table constraints do not include NOT NUL.
> But you can use CHECK as workaround:
>
>     ALTER TABLE authors ADD CHECK (NOT authorfirstname = NULL);
>
> Arne.
>
> Tim Boring wrote:
> >
> > Can you change a column modifier after you've created the table?  For
> > example, I have a table called "authors" with the following columns:
> > authorid, authorfirstname, authorlastname, authormi, statecode, country,
> > born, deceased.
> >
> > When I created the table, I forgot to make the "authorfirstname" and
> > "authorlastname" columns NOT NULL.  I've looked at ALTER TABLE but I
> > don't see a way to use it to add NOT NULL...maybe I'm just missing the
> > obvious?
> >
> > Any help/suggestions are appreciated.
> >
> > Thanks,
> > Tim
> >
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