Re: question regarding REFERENCES and INHERITS

On Mon, 31 Mar 2003, Beatrice Yueksel wrote:

> Hi,
> I made some test with REFERENCES and INHERITS.
> I know from the mailing list that :
> "Referential integrity only applies to the named table and not
> any child tables..."

As a note, this phrase was intended to apply to the target referenced
table (schiff_art in this case).

> I have 3 tables:
> art,
> schiff_admin (for administration with rules, view, etc...)
> schiff (inherits schiff_admin)
>
> There is one reference from schiff_admin to art.
> The reference doesn't work in schiff.
>
> If I add a constraint:
>
> ALTER TABLE schiff_admin
> ADD CONSTRAINT schiff_admin_fk_art
> FOREIGN KEY(art)
> REFERENCES
> schiff_art (art) ON DELETE NO ACTION ;
>
> the reference works also in schiff.
>
> Why the reference is inherited after the "alter table" and not before?

Because inheritance is wierd right now :) Seriously, the alter table
is appearing to recurse the tree (as of the time the constraint is made),
however create table inherits doesn't make the triggers. With
pg_constraint in place, that might actually not be as hard now.