9-28. Consider your answers to parts a and b of Problem and Exercise 7-27 in Chapter 7.
a. Transform the E-R diagram you devel- oped in part a into a set of 3NF relations. Clearly identify primary and foreign keys. Explain how you determined the primary key for any many-to-many relationships or associative entities.
b. Transform the E-R diagram you devel- oped in part b into a set of 3NF relations. Clearly identify primary and foreign keys. Explain how you determined the primary key for any many-to-many relationships or associative entities.