EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
12th Edition
ISBN: 8220101450739
Author: Morris
Publisher: YUZU
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Chapter 9, Problem 5P
Explanation of Solution
Design of video rental
The below is the design of video rental database that includes the support of all rental activities such as customer payment, work schedule of the employee, checkout which employee has processed the videos for the customers.
Explanation:
- Every movie is classified based on the type and the relationship between MOVIE and TYPE is N:1.
- One movie gets rented many times and the relationship between the MOVIE and RENTAL is 1:N.
- Every customer needs to pay for the rental made and the relationship between CUSTOMER and RENTAL is 1:N.
- Employee gathers details and writes about the rental made and the relationship between EMPLOYEE and RENTAL is 1:N.
- Every employee sign a work log and the relationship between the EMPLOYEE and WORK_LOG is 1:N
- Every schedule of the Employee gets enters and the relationship between the EMPLOYEE and Schedule is 1:N...
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7. See the code below and solve the following.
public class Test {
public static void main(String[] args) {
int result = 0;
}
result = fn(2,3);
System.out.println("The result is:
+ result);
// fn(x, 1) = x
// fn(x, y)
=
fn(x, y-1) + 2, when y>1
public static int fn(int x, int y) {
if (x <= 1)
return x;
else
return fn(x, y-1) + 2;
}
}
7-1. This program has a bug that leads to infinite recursion. Modify fn(int x, int y) method to fix
the problem. (2 point)
7-2. Manually trace the recursive call, fn(2,3) and show the output (step by step). (2 point)
7-3. Can you identify the Base Case in recursive method fn(int x, int y)? (1 point)
Chapter 9 Solutions
EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
Knowledge Booster
Similar questions
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