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?
Which implementation should I pick (or another)?
> Further patch will utilise this new knowledge to reduce the number of
> tests made during constraint_exclusion.
Best Regards, Simon Riggs