Figuer:
CUSTOMER (primary key = CID)

\begin{array}{|l|l|l|l|l|}\hline \text { CID } & \text { CNAME } & \text { AGE } & \text { RESID\_CITY } & \text { Cregion } \\\hline 10 & \text { BLACK } & 40 & \text { SD } & \text { SD } \\\hline 20 & \text { GREEN } & 25 & \text { SD } & \text { SD } \\\hline 30 & \text { JONES } & 30 & \text { La Mesa } & \text { SD } \\\hline 40 & \text { MARTIN } & 35 & \text { LA } & \text { LA } \\\hline 50 & \text { SIMON } & 22 & \text { Pomona } & \text { LA } \\\hline 60 & \text { VERNON } & 60 & \text { Poway } & \text { SD } \\\hline\end{array}

RENTALS (primary key = RTN)

\begin{array} { | l | l | l | l | l | l | l | l | } \hline \text { CID } & \text { MAKE } & \text { DATE\_OUT } & \text { PICKUP } & \text { RETURN } & \text { RTN } & \text { VIN } & \text { DATE-IN } \\\hline 10 & \text { FORD } & \text { 10-Oct-00 } & \text { SD } & \text { SD } & 1 & \text { F1 } & \text { 01-Dec-00 } \\\hline 10 & \text { GM } & 01 - \text { Jan-01 } & \text { SD } & \text { LA } & 2 & & \\\hline 10 & \text { FORD } & 01 - \text { Feb-01 } & \text { LA } & \text { SD } & 3 & & \\\hline 20 & \text { NISSAN } & 07 - J u l - 00 & \text { SD } & & 4 & \text { N1 } & \\\hline 30 & \text { FORD } & 01 - J u l - 00 & \text { SD } & \text { SD } & 5 & \text { F2 } & 30 \text {-Nov-00 } \\\hline 30 & \text { GM } & 01 - \text {-Dec-00 } & \text { SD } & \text { SD } & 6 & \text { G1 } & \\\hline 40 & \text { FORD } & 01 - \text { Aug-00 } & \text { LA } & \text { LA } & 7 & \text { F3 } & \\\hline 50 & \text { GM } & 01 - \text { Sep-00 } & \text { LA } & \text { SD } & 8 & \text { G2 } & \\\hline 60 & \text { NISSAN } & 02 \text {-Jan-01 } & \text { SD } & \text { LA } & 9 & & \\\hline\end{array}

In the table RENTALS, RTN provides the rental number (it is the primary key), CID refers to the CID in CUSTOMER, PICKUP is the city where the car was (or will be) picked up and Return is the city where the car was (or will be) returned, VIN is a foreign key that references the table CAR. The rental company has two branches, one in San Diego (SD) and one in Los Angeles (LA). Cars are picked up and returned by the customers at these two locations.
RENTCOST

\begin{array} { | l | l | } \hline \text { MAKE } & \text { COST } \\\hline \text { FORD } & 30 \\\hline \text { GM } & 40 \\\hline \text { NISSAN } & 30 \\\hline \text { TOYOTA } & 20 \\\hline \text { VOLVO } & 50 \\\hline\end{array}

In RENTCOST, COST shows the base cost of renting a given MAKE for one day.
CAR

\begin{array} { | l | l | l | l | } \hline \text { VIN } & \text { MAKE } & \text { RENTED } & \text { AT } \\\hline \text { F1 } & \text { FORD } & \text { NO } & \text { SD } \\\hline \text { F2 } & \text { FORD } & \text { NO } & \text { SD } \\\hline \text { F3 } & \text { FORD } & \text { YES } & \text { IR } \\\hline \text { F4 } & \text { FORD } & \text { NO } & \text { LA } \\\hline \text { G1 } & \text { GM } & \text { YES } & \text { SD } \\\hline \text { G2 } & \text { GM } & \text { YES } & \text { SD } \\\hline \text { N1 } & \text { NISSAN } & \text { YES } & \text { LA } \\\hline \text { N2 } & \text { NISSAN } & \text { NO } & \text { LA } \\\hline \text { T1 } & \text { TOYOTA } & \text { NO } & \text { IR } \\\hline \text { T2 } & \text { TOYOTA } & \text { NO } & \text { IR } \\\hline \text { V1 } & \text { VOLVO } & \text { NO } & \text { LA } \\\hline \text { V2 } & \text { VOLVO } & \text { NO } & \text { LA } \\\hline\end{array}

The table CAR (primary key = VIN) provides information about each car, in particular if it is currently rented, and where its usual storage location is (attribute AT).
CREATE VIEW CUST_SD AS
SELECT * FROM CUSTOMER
WHERE Cregion = 'SD'
CREATE VIEW CUST_40D AS
SELECT CNAME, RENTALS.MAKE, RENTCOST.COST
FROM CUSTOMER, RENTALS, RENTCOST
WHERE CUSTOMER.CID = RENTALS.CID
AND RENTALS.MAKE = RENTCOST.MAKE
AND RENTCOST < 40
CREATE VIEW Make_View (Make, NumRentals, Cregion, Storageat) AS
SELECT RENTALS.MAKE, Count (RTN), Cregion, AT
FROM CUSTOMER, RENTALS, CAR
WHERE CUSTOMER.CID = RENTALS.CID
AND RENTALS.VIN = CAR.VIN
GROUP BY RENTALS.MAKE, Cregion, At
-SELECT CUST_SD.CNAME,RENTALS.DATE_OUT FROM CUST_SD,RENTALS
WHERE CUST_SD.CID = RENTALS.CID
AND CUST_SD.Cregion = RENTALS.RETURN
The number of rows displayed by this SELECT statement is:
A) 3
B) 4
C) 5 or more
D) 0

When Defining a View Using SQL

Multiple Choice

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