Re: Data independence

From: Alfredo Novoa <alfredo_at_ncs.es>
Date: Thu, 13 May 2004 14:42:29 GMT
Message-ID: <40a3541e.4167071@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.

>There is a way of writing applications that are not affected by this change
>?

Using a DBMS.

Regards
Alfredo Received on Thu May 13 2004 - 09:42:29 CDT