Обсуждение: cascade and restrict options to alter domain drop constraint

I am puzzled by the cascade and restrict options to the alter domain
drop constraint command.

I do not see how a dropping a check constraint should cascade to
anything, or indeed be restricted by anything.

My reasoning is simple: if I drop a check constraint on a domain, no
data should be affected, so no dependant objects should be affected.

Could someone please explain what I am missing?

Thanks in advance

__
Marc

Marc Munro <marc@bloodnok.com> writes:
> I am puzzled by the cascade and restrict options to the alter domain
> drop constraint command.

They don't do anything.

I think they were put in because we have this meme that the SQL spec
requires RESTRICT/CASCADE options on every type of DROP, but so far
as I can see, SQL99 has no such option for ALTER DOMAIN DROP CONSTRAINT.
So maybe it's a bug that we take the options for it.  Or maybe it's
better to leave them there, in case people are expecting them to
be there on the same reasoning.

            regards, tom lane