Re: Message about not null in ALTER TABLE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)atentus(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: Message about not null in ALTER TABLE
Date: 2002-01-22 20:55:45
Message-ID: 28347.1011732945@sss.pgh.pa.us
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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

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