Re: THe OverRelational Manifesto (ORM)
Date: 19 Apr 2006 22:40:51 -0700
Message-ID: <1145511651.287242.28710_at_v46g2000cwv.googlegroups.com>
>>is not a SET - it is just single relation. Do you understang the
>>difference between single relation and SET of relations? It is the same
>>as difference between single relation and DB.
>Relation valued attributes in base relvars are deprecated except in
>some rare cases, and this is not one of them.
Once again. There is NO some "Relation valued attributes" in set of relations in R-projections at all. But there is a complex structure in orthogonal OO-projection, but this is NOT relational projection.
R-projection is pure relational system where set of relations, defined on set of ONLY scalar domains, exist only. OO-projection is really OO system.
>Tutorial D might solve the problem...
O I've heard these words very often. But nobody can show it :).
In TheORM all these things looks really simply. In TheORM we don't need
use the things like "sub-relvalrs and super-relvars, relation type
definition" you write about to get really polymorphous system. Just
usual relations - it's enough.
>>...Although you could create a valid D with these features.
I couldn't. Nobody have been able still. Can you? Show me an example.
Received on Thu Apr 20 2006 - 07:40:51 CEST