Re: Data independence

From: Alfredo Novoa <alfredo_at_ncs.es>
Date: Mon, 17 May 2004 12:55:17 GMT
Message-ID: <40a75cf3.3179291@news-read2.maxwell.syr.edu>

On Thu, 13 May 2004 23:52:43 +0100, Paul <paul_at_test.com> wrote:

>But suppose for example you have a table where the some two columns are
>defined to be the primary key. Your application displays a window with
>two fields for people to enter data.

You may have an application which reads the catalog tables and displays all the attributes.

>Now you change the primary key to be some *three* columns. Or maybe two
>totally different columns. It then becomes impossible to use the
>application.

You can use a default value for the hidden column.

Regards
Alfredo Received on Mon May 17 2004 - 07:55:17 CDT