Re: Transitive Closure

Paul <paul_at_test.com> wrote in message news:<Ajlpc.3453$wI4.382625_at_wards.force9.net>...
> OK I've just been reading up in this (for example Date & Darwen's "Third
> Manifesto" book mentions it) and the suggestion is to have a
> "generalized transitive closure" operator that includes these kind of
> aggregates along paths. For example see here:
> http://citeseer.ist.psu.edu/nag95implementing.html

I'm stuck on p.23 with the query

select*
from flights
start F
closure F.p = flights.b
compose F(flights.e, F.dist.plus(flights.time))

I don't see join condition flights.b=flights.e anywhere in the query. Received on Mon May 17 2004 - 16:53:27 CDT