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Home -> Community -> Usenet -> comp.databases.theory -> Re: Oids
vc wrote:
> Vadim Tropashko wrote:
> > Mikito Harakiri wrote:
> > > vc wrote:
> > > > To sum up, the three '1' '0' combinations are :
> > > >
> > > > 00 union A = 01
> > >
> > > No rowids, then. Sigh.
> >
> > To wake up Marshall: rowids are object identifiers.
>
> What rowids do you keep talking about ?
>
> If I understand your "generalized union" definition correctly, '00
> union A' will return at best a relation with one empty tuple. Where's
> the rowid ?
According to your corrected definition
rowids(A) = Ox = 00 union A
Well, in your model rowids(A) is either 00 or 01, and your model might even turn out to be consistent. Note, however, nothing prevents us from defining
rowids(A) = Ox = 00 union A
where x is the set corresponding to the natural number - cardinality of A Received on Wed Aug 17 2005 - 15:41:08 CDT
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