Re: Newbie question about db normalization theory: redundant keys OK?
From: David Cressey <cressey73_at_verizon.net>
Date: Fri, 28 Dec 2007 13:45:04 GMT
Message-ID: <A57dj.397$cq5.319_at_trndny06>
Date: Fri, 28 Dec 2007 13:45:04 GMT
Message-ID: <A57dj.397$cq5.319_at_trndny06>
"Brian Selzer" <brian_at_selzer-software.com> wrote in message
news:lTXcj.3065$lo5.1456_at_newssvr19.news.prodigy.net...
> You're sidestepping the issue. The information need not be preserved in
That is plainly and simply not true. If the information is not preserved in
the
> database in order to be useful: it may only be needed to decide whether or
> not to permit an update. In any case, your demonstration would not prove
> that there is /always/ a way to tell which transformation actually
occurred.
> I noticed that you ignored the balance of my last post.
>