Re: Do Data Models Need to built on a Mathematical Concept?
Date: Sat, 03 May 2003 19:08:21 GMT
Message-ID: <FsUsa.718639$L1.205112_at_sccrnsc02>
"Neo" <neo55592_at_hotmail.com> wrote in message news:4b45d3ad.0305021419.4226e8b_at_posting.google.com...
> > > All-in-all, the Relational Data Model is one of the best
> > > at the present time, but it too has its flaws and limitations.
> >
> > What are the flaws and limitations you had in mind?
>
> 1. That all rows of a table have the same number of columns
> which leads to the need for NULLs.
There is nothing about relations that require nulls.
> 2. That all values in a column be of the same type.
This is not generally regarded as a limitation. It is like saying that addition is limited because it cannot operate on dates.
Can you give us an example of some operation you'd like to perform that can't be handled with relations and relational operators?
Marshall Received on Sat May 03 2003 - 21:08:21 CEST