Suppose you want to show that a person can have multiple degrees. Would each of the
QUESTION:
Suppose you want to show that a person can have multiple degrees. Would each of the following two ER diagrams get the job done? Why or why not? What is the difference?
SOLUTION:
The ER diagram on the left permits specification of a maximum of three degrees – in fact, only three specific degrees. The ER diagram on the right, however, is more flexible in that it permits specification of multiple degrees of any kind including no degrees.