> AFAIK, the extra index only slows down my inserts - it basically contains
> no usable information...
Not 100% true. It will speed up cascade delete and update...
> shouldn't the presence of _primary_key_ in
> multicol foreign key be enough to decide whether the whole key is unique
> or not?
Hmmm - thinking about it, I don't see why postgres would need the entire
thing to be unique...can't think of a reason at the moment. Stephen?
Chris