Re: ID field as logical address
Date: Tue, 2 Jun 2009 19:56:42 -0700 (PDT)
Message-ID: <2196de54-5f7f-49d8-83f2-408be72f7576_at_q37g2000vbi.googlegroups.com>
On May 29, 8:54 pm, "Walter Mitty" <wami..._at_verizon.net> wrote:
> Now, if we update the LastName, the FirstName, and the Phone number of an
That's rather fuzzy until you say what you mean by 'entry'. Does it
mean value or variable? It cannot be referring to the tuple because
after the update it is a different tuple. Evidently 'entry' means
> entry, it's still the same entry, because the ID field retains the same
> value.
> So, Brian's claim that deleting a value and inserting a new one is somehow
> really different from updating an existing value works in this model, if
> you regard ID as somehow "special", and not "part of the value recorded in
> the table".
For a given variable that holds a set of values you can indeed delete a value or insert a value but you cannot update a value. You can only update a variable. Received on Wed Jun 03 2009 - 04:56:42 CEST