Re: Multiple specification of constraints

"Dawn M. Wolthuis" <dwolt_at_tincat-group.com> wrote in message news:c225fl$rob$1_at_news.netins.net...
> > If I enter my Date
> > of Birth as 01-Jan-1972 (which it isn't), there is no conceivable
> > constraint that will say "Error: lying about your age! And I know you
> > are a Taurus!"
>
> Yes -- and that shows that data type constraints are but one aspect of data
> integrity.

I might point out a terminology issue here. In general, I have not seen the word "integrity" (in a data management context) used to describe the issue of whether the data matches what it is supposed to match in the outside world. The word is used only to refer to the internal consistency of the data.

The larger problem you mention, getting the external predicate and the internal predicate to be linked in some way, is insoluable, and so we don't talk about it too much.

Marshall Received on Wed Mar 03 2004 - 09:16:18 CET