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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