Neil Conway <neilc(at)samurai(dot)com> writes:
> Note that although both rules are DO INSTEAD, they both get fired for
> the insertion.
DO INSTEAD means that the *original* query will not execute; it does
not suppress actions produced by other rules. If we did not define
it that way, I think your example would have to error out --- how
would you choose which INSTEAD rule wins?
regards, tom lane