> http://www.utexas.edu/its/windows/database/datamodeling/dm/hierarchies.html
Suppose a system is implemented as shown in "Figure 1: Examples of
Generalization Hierarchies". The next day, a student who is not a
person (he is a martian) shows up for enrollment? Where do I put him in
the type hierarchy? Or the next day, the univeristy hires a horse (Mr
Ed) to be a faculty member. Where do I put him in the hierarchy? Or the
next day, the university hires security robots to be staff members.
Where do I put them in the hierarchy?
Received on Sat Jan 13 2007 - 09:32:39 CST
