Database Modeling and Design

Exercises 253
Problem 6-3
1. From the ER diagram given below and the resulting tables and
candidate key attributes defined, what are all the functional
dependencies (FDs) you can derive just by looking at the diagram
and list of candidate keys?
Table
customer
order
department
salesperson
item
order-dept-sales
order-item-sales
Table
customer
order
department
salesperson
item
order-dept-sales
order-item-sales
Candidate Key(s)
cid
orderno
deptno
sid
itemno
orderno,sid AND orderno,deptno
orderno, itemno
FDs
2. What is the level of normalization for each of these tables, based
on the information given?
Problem 6-4
The following functional dependencies (FDs) represent a set of airline
reservation system database constraints. Design a minimum set of BCNF
tables, preserving all FDs, and express your solution in terms of the code
letters given below (a time-saving device for your analysis). Is the set of
tables you derived also BCNF?
reservation_no -> agent_no, agent_name, airline_name, flight_no,
passenger_name
reservation_no -> aircraft_type, departure_date, arrival_date,
departure_time, arrival_time