> One more question: does the FK checker know to skip checking a
> constraint if the column in question did not change during an update?
>
> That is, if I have a user table that references an owner_id in an
> owners table as a foreign key, but I update fields other than owner_id
> in the user table, will it still try to verify that owner_id is a
> valid value even though it did not change?
>
> I'm using PG 7.4.
As of 7.4, yes the check is skipped.
Chris