What is a type error?

[Marshall]

Chris Smith wrote:
> Joachim Durchholz <jo at durchholz.org> wrote:
> > I fail to see an example that would support such a claim.
> >
> > On the other hand, UPDATE can assign any value to any field of any
> > record, so it's doing exactly what an assignment does. INSERT/DELETE can
> > create resp. destroy records, which is what new and delete operators
> > would do.
> >
> > I must really be missing the point.
>
> I *think* I understand Marshall here.  When you are saying "assignment",
> you mean assignment to values of attributes within tuples of the cell.
> When Marshall is saying "assignment", he seems to mean assigning a
> completely new *table* value to a relation; i.e., wiping out the entire
> contents of the relation and replacing it with a whole new set of
> tuples.  Your assignment is indeed less powerful than DML, whereas
> Marshall's assignment is more powerful than DML.

Exactly.


Marshall