Re: Data independence

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"Alfredo Novoa" <alfredo_at_ncs.es> wrote in message news:40a3541e.4167071_at_news-read3.maxwell.syr.edu...
> On Thu, 13 May 2004 13:56:23 +0300, "x" <x-false_at_yahoo.com> wrote:
>
> >Suppose you have an application that use some relvars like this:
> > R(A1,A2,A3,A4,B1,B2,B3,...)
> >where {A1,A2,A3} is a candidate key for R.
> >After some time you find out that {A1,A2,A3,A4} is the "real" candidate
key
> >for R.
> >Do you need to modify the application ?
>
> No.

Would you ask somebody else to modify it for you ?

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