> > > What are the flaws and limitations you had in mind?
> >
> > 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.
Just as in pure set theory, I want the flexibility that the elements
can be anything. 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). If I
think of a set of arbitrary thing in my mind, I don't think about
their type to decide if they can on cannot be included in that set. If
the things in a set are of different types, I probably would not be
performing operations such as add or average on them.
Received on Sat May 03 2003 - 22:19:13 CDT
