Repeat Exercise 4.5, but use the AIRLINE schema of Figure 3.8.

Question

What will be an ideal response?

Answer 1

The following referential integrity constraints should hold:
FLIGHT_LEG.(FLIGHT_NUMBER) --> FLIGHT.(NUMBER)
FLIGHT_LEG.(DEPARTURE_AIRPORT_CODE) --> AIRPORT.(AIRPORT_CODE)
FLIGHT_LEG.(ARRIVAL_AIRPORT_CODE) --> AIRPORT.(AIRPORT_CODE)
LEG_INSTANCE.(FLIGHT_NUMBER, LEG_NUMBER) -->
FLIGHT_LEG.(FLIGHT_NUMBER, LEG_NUMBER)
LEG_INSTANCE.(AIRPLANE_ID) --> AIRPLANE.(AIRPLANE_ID)
LEG_INSTANCE.(DEPARTURE_AIRPORT_CODE) --> AIRPORT.(AIRPORT_CODE)
LEG_INSTANCE.(ARRIVAL_AIRPORT_CODE) --> AIRPORT.(AIRPORT_CODE)
FARES.(FLIGHT_NUMBER) --> FLIGHT.(NUMBER)
CAN_LAND.(AIRPLANE_TYPE_NAME) --> AIRPLANE_TYPE.(TYPE_NAME)
CAN_LAND.(AIRPORT_CODE) --> AIRPORT.(AIRPORT_CODE)
AIRPLANE.(AIRPLANE_TYPE) --> AIRPLANE_TYPE.(TYPE_NAME)
SEAT_RESERVATION.(FLIGHT_NUMBER, LEG_NUMBER, DATE) -->
LEG_INSTANCE.(FLIGHT_NUMBER, LEG_NUMBER, DATE)
One possible set of CREATE TABLE statements to define the database is given below.
CREATE TABLE AIRPORT ( AIRPORT_CODE CHAR(3) NOT NULL,
NAME VARCHAR(30) NOT NULL,
CITY VARCHAR(30) NOT NULL,
STATE VARCHAR(30),
PRIMARY KEY (AIRPORT_CODE) );
CREATE TABLE FLIGHT ( NUMBER VARCHAR(6) NOT NULL,
AIRLINE VARCHAR(20) NOT NULL,
WEEKDAYS VARCHAR(10) NOT NULL,
PRIMARY KEY (NUMBER) );
CREATE TABLE FLIGHT_LEG ( FLIGHT_NUMBER VARCHAR(6) NOT NULL,
LEG_NUMBER INTEGER NOT NULL,
DEPARTURE_AIRPORT_CODE CHAR(3) NOT NULL,
SCHEDULED_DEPARTURE_TIME TIMESTAMP WITH TIME ZONE,
ARRIVAL_AIRPORT_CODE CHAR(3) NOT NULL,
SCHEDULED_ARRIVAL_TIME TIMESTAMP WITH TIME ZONE,
PRIMARY KEY (FLIGHT_NUMBER, LEG_NUMBER),
FOREIGN KEY (FLIGHT_NUMBER) REFERENCES FLIGHT (NUMBER),
FOREIGN KEY (DEPARTURE_AIRPORT_CODE) REFERENCES
AIRPORT (AIRPORT_CODE),
FOREIGN KEY (ARRIVAL_AIRPORT_CODE) REFERENCES
AIRPORT (AIRPORT_CODE) );
CREATE TABLE LEG_INSTANCE ( FLIGHT_NUMBER VARCHAR(6) NOT NULL,
LEG_NUMBER INTEGER NOT NULL,
LEG_DATE DATE NOT NULL,
NO_OF_AVAILABLE_SEATS INTEGER,
AIRPLANE_ID INTEGER,
DEPARTURE_AIRPORT_CODE CHAR(3),
DEPARTURE_TIME TIMESTAMP WITH TIME ZONE,
ARRIVAL_AIRPORT_CODE CHAR(3),
ARRIVAL_TIME TIMESTAMP WITH TIME ZONE,
PRIMARY KEY (FLIGHT_NUMBER, LEG_NUMBER, LEG_DATE),
FOREIGN KEY (FLIGHT_NUMBER, LEG_NUMBER) REFERENCES
FLIGHT_LEG (FLIGHT_NUMBER, LEG_NUMBER),
FOREIGN KEY (AIRPLANE_ID) REFERENCES
AIRPLANE (AIRPLANE_ID),
FOREIGN KEY (DEPARTURE_AIRPORT_CODE) REFERENCES
AIRPORT (AIRPORT_CODE),
FOREIGN KEY (ARRIVAL_AIRPORT_CODE) REFERENCES
AIRPORT (AIRPORT_CODE) );
CREATE TABLE FARES ( FLIGHT_NUMBER VARCHAR(6) NOT NULL,
FARE_CODE VARCHAR(10) NOT NULL,
AMOUNT DECIMAL(8,2) NOT NULL,
RESTRICTIONS VARCHAR(200),
PRIMARY KEY (FLIGHT_NUMBER, FARE_CODE),
FOREIGN KEY (FLIGHT_NUMBER) REFERENCES FLIGHT (NUMBER) );
CREATE TABLE AIRPLANE_TYPE ( TYPE_NAME VARCHAR(20) NOT NULL,
MAX_SEATS INTEGER NOT NULL,
COMPANY VARCHAR(15) NOT NULL,
PRIMARY KEY (TYPE_NAME) );
CREATE TABLE CAN_LAND ( AIRPLANE_TYPE_NAME VARCHAR(20) NOT NULL,
AIRPORT_CODE CHAR(3) NOT NULL,
PRIMARY KEY (AIRPLANE_TYPE_NAME, AIRPORT_CODE),
FOREIGN KEY (AIRPLANE_TYPE_NAME) REFERENCES
AIRPLANE_TYPE (TYPE_NAME),
FOREIGN KEY (AIRPORT_CODE) REFERENCES
AIRPORT (AIRPORT_CODE) );
CREATE TABLE AIRPLANE ( AIRPLANE_ID INTEGER NOT NULL,
TOTAL_NUMBER_OF_SEATS INTEGER NOT NULL,
AIRPLANE_TYPE VARCHAR(20) NOT NULL,
PRIMARY KEY (AIRPLANE_ID),
FOREIGN KEY (AIRPLANE_TYPE) REFERENCES AIRPLANE_TYPE (TYPE_NAME) );
CREATE TABLE SEAT_RESERVATION ( FLIGHT_NUMBER VARCHAR(6) NOT NULL,
LEG_NUMBER INTEGER NOT NULL,
LEG_DATE DATE NOT NULL,
SEAT_NUMBER VARCHAR(4),
CUSTOMER_NAME VARCHAR(30) NOT NULL,
CUSTOMER_PHONE CHAR(12),
PRIMARY KEY (FLIGHT_NUMBER, LEG_NUMBER, LEG_DATE, SEAT_NUMBER),
FOREIGN KEY (FLIGHT_NUMBER, LEG_NUMBER, LEG_DATE) REFERENCES
LEG_INSTANCE (FLIGHT_NUMBER, LEG_NUMBER, LEG_DATE) );