Re: Do Data Models Need to built on a Mathematical Concept?

> > But, in the rdb model, that flexibility cannot be
> > fully realized because the type of values in a domain is restricted to
> > some hardware dependent type (ie int, long, date, 50 chars, etc).
>
> That might be a limitation on, say, Oracle, but it's not a limitation
> of the relational model. Domains can be anything; the relational
> model doesn't say anything about them at all, other than to say
> they are sets of values.

You are correct, in the rdb model itself, a tuple's values are not associated with any data type. Data types only appear in implementation of the rdb model. Received on Mon May 05 2003 - 02:06:22 CEST