Re: how to create a non-inherited CHECK constraint in CREATE TABLE

Alvaro Herrera <alvherre@commandprompt.com> writes:
> Excerpts from Nikhil Sontakke's message of mié abr 11 15:07:45 -0300 2012:
>> This patch removes the support for :
>> 
>> ALTER TABLE ONLY constraint_rename_test ADD CONSTRAINT con2 CHECK (b > 0);
>> 
>> and uses
>> 
>> ALTER TABLE constraint_rename_test ADD CONSTRAINT con2 CHECK ONLY (b > 0);
>> 
>> I know it's a bit late in the commitfest, but if this patch makes this
>> feature more "complete", maybe we should consider...

> Personally I don't think we should consider this for 9.2.

Well, if we're going to regret having offered the other syntax, now
would be the time to figure that out, before we ship it not after.
I would go so far as to say that if we don't accept this for 9.2
we probably shouldn't accept it at all, because two different ways
to spell the same thing isn't nice.

I don't really care for the idea that the ONLY goes in a different place
for this operation than for every other kind of ALTER TABLE, but it does
make sense if you subscribe to the quoted theory that ONLY is a property
of the constraint and not the ALTER command as such.
        regards, tom lane