David Portas wrote:
> DA Morgan wrote:
>> Second Normal Form
>> tables do not have composite primary keys
>>
>
> I realize that your definitions are only informal but this one is a
> total mistake. 2NF does not imply the absence of composite keys.

Not informal at all. Perhaps this will clarify it.

"Second normal form (2NF) requires that data stored in a table with a
composite primary key must not be dependent on only part of the table's
primary key"

http://en.wikipedia.org/wiki/Databas...nd_normal_form
--
Daniel A. Morgan
University of Washington
damorgan@x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org