Re: [PATCHES] Inherited Constraints

On Thu, 2005-12-08 at 11:10 +0000, Simon Riggs wrote:
> On Wed, 2005-12-07 at 21:24 +0000, Simon Riggs wrote:
> > Following patch implements record of whether a constraint is inherited
> > or not, and prevents dropping of inherited constraints.
>
> Patch posted to -patches list.
>
> > What it doesn't do:
> > It doesn't yet prevent dropping the parent constraint, which is wrong,
> > clearly, but what to do about it?
> > 1. make dropping a constraint drop all constraints dependent upon it
> > (without any explicit cascade)
> > 2. add a new clause to ALTER TABLE .... DROP CONSTRAINT .... CASCADE
> >
> > I prefer (1), since it is SQL Standard compliant, easier to remember and
> > automatic de-inheritance is the natural opposite of the automatic
> > inheritance process.
>
> Comments, please -hackers?

Late night hacking again....

ALTER TABLE .... DROP CONSTRAINT .... CASCADE

does of course already exist, so the following should cause dependency
violation ERRORs:
- omitting the CASCADE when attempting to delete parent constraint
- attempting to drop the child constraint

Best Regards, Simon Riggs