Re: Message about not null in ALTER TABLE

Alvaro Herrera <alvherre(at)atentus(dot)com> writes:
> However, there is no way to add a NOT NULL constraint to an existing
> column in a table, so the error message is misleading.

Sure there is:

regression=# create table test (a int);
CREATE
regression=# alter table test add column b int not null;
ERROR: Adding NOT NULL columns is not implemented.
Add the column, then use ALTER TABLE ADD CONSTRAINT.
regression=# alter table test add column b int;
ALTER
regression=# alter table test add constraint bnotnull check (b notnull);
ALTER
regression=#

It'd be nice to have more ALTER TABLE variants implemented, but it's
not true that you can't get the functionality nohow...

regards, tom lane