Re: View Updates Problem Statement
Date: Mon, 8 Sep 2003 19:33:37 -0700
Message-ID: <v6b7b.31$741.153_at_news.oracle.com>
"Mikito Harakiri" <mikharakiri_at_ywho.com> wrote in message
news:BBa7b.29$741.241_at_news.oracle.com...
> Database A has relations RA1, RA2, RA3, ...
> Database B has relations RB1, RB2, ...
>
> Views V1, V2, V3, ... establish the mapping between the 2 databases:
>
> V1*RA1 = RB1
> V2*RA2 = RB2
> ...
Terminology sucks. Since now on by "view" I assume an operator transforming input relation into output relation (while the literature calls a view just an output relation variable). That definition is more consistent with algebraic view update ideas that I'm trying to convey.
Note nice symmetry: we have an input "vector" of relational variables (RA1, RA2, ...) transformed by the system of views V1,V2,... into the output vector of relational variables (RB1, RB2, ...) Received on Tue Sep 09 2003 - 04:33:37 CEST