Re: RI checks during UPDATEs

"Simon Riggs" <simon@2ndquadrant.com> writes:
> Any objections to implementing this?

Only that it was done a long time ago --- see
RI_FKey_keyequal_upd_pk/fk.

> It would be even better if there was some way of not executing the
> trigger at all if we knew that the UPDATE statement doesn't SET the FK
> columns.

People keep suggesting that, and the counterexample is always that you
can't know what a BEFORE trigger might do to the row.
        regards, tom lane