Re: two nasty schemata, union types and surrogate keys
From: Reinier Post <rp_at_raampje.lan>
Date: 21 Oct 2009 23:38:20 GMT
Message-ID: <4adf9b6c$0$23187$703f8584_at_news.kpn.nl>
Date: 21 Oct 2009 23:38:20 GMT
Message-ID: <4adf9b6c$0$23187$703f8584_at_news.kpn.nl>
I just wrote:
>??? No. Under both representations, the tuples in a relation represent
>statements supposed to be true. The difference regards only the tuples
>*not* in the relation: under the CWA, these correspond to statements
>supposed to be false, while under the OWA they may just as well be false.
true
Darn. Double negation :(
-- ReinierReceived on Thu Oct 22 2009 - 01:38:20 CEST