Re: views of binary operations
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Thu, 20 Jul 2006 12:37:51 GMT
Message-ID: <zOKvg.12760$pu3.293114_at_ursa-nb00s0.nbnet.nb.ca>
Date: Thu, 20 Jul 2006 12:37:51 GMT
Message-ID: <zOKvg.12760$pu3.293114_at_ursa-nb00s0.nbnet.nb.ca>
David Cressey wrote:
> "Marshall" <marshall.spight_at_gmail.com> wrote in message
> news:1153017368.456165.270950_at_m73g2000cwd.googlegroups.com...
>
> I'm not familiar with the usage of the word "snapshot" in the literature,
> other than in product specific contexts.
Among relational folks, a snapshot is a stored, derived relvar. A view is a derived relvar.
A snapshot often contains a static value for a period of time when the relvars from which it was derived can change, which makes it logically distinct from a view. Received on Thu Jul 20 2006 - 14:37:51 CEST