Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 6RQ
What are “referential constraint actions”?
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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)
6. See the code below and solve the following.
import java.io.*;
public class DataStream {
}
public static void main(String[] args)
}
DataOutputStream output = new DataOutputStream(new FileOutputStream("temp.dat"));
output.writeUTF("Book1");
output.writeInt(85);
output.writeUTF("Book2");
output.writeInt(125);
output.writeUTF("Book3");
output.writeInt(70);
output.close();
// ToDo: Read all data from temp.dat and print the data to the standard output (monitor)
6-1. This program has a compile error, and the message is “Unhandled exception type
FileNotFoundException". How do you fix this error? (1 point)
6-2. Is FileNotFoundException a checked exception or an unchecked exception? (1 point)
6-3. What is the difference between checked exception and unchecked exception? (1 point)
6-4. Please complete the above program by reading all data from temp.dat and print the data
to the standard output (monitor) by using System.out.print, System.out.println or
System.out.printf method. (2 points)
Write a program that reads a list of integers from input and determines if the list is a palindrome (values are identical from first to last and last to first). The input begins with an integer indicating the length of the list that follows. Assume the list will contain a maximum of 20 integers. Output "yes" if the list is a palindrome and "no" otherwise. The output ends with a newline.
Hints: - use a for loop to populate the array based on the specified size (the first number entered)
- use a for loop to check first value with last value, second value with second from end, etc.
- if the values do not match, set a Boolean variable to flag which statement to output (yes or no)
Ex: If the input is (remember to include spaces between the numbers):
6 1 5 9 9 5 1
the output is:
yes
Ex: If the input is:
5 1 2 3 4 5
the output is: C++ coding
Chapter 7 Solutions
Database Systems: Design, Implementation, & Management
Ch. 7 - Prob. 1RQCh. 7 - Explain why the following command would create an...Ch. 7 - Prob. 3RQCh. 7 - Explain why it might be more appropriate to...Ch. 7 - What is the difference between a column constraint...Ch. 7 - What are referential constraint actions?Ch. 7 - Rewrite the following WHERE clause without the use...Ch. 7 - Explain the difference between an ORDER BY clause...Ch. 7 - Explain why the following two commands produce...Ch. 7 - What is the difference between the COUNT aggregate...
Ch. 7 - Prob. 11RQCh. 7 - Prob. 12RQCh. 7 - Write the SQL code that will create the table...Ch. 7 - Having created the table structure in Problem 1,...Ch. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Write the SQL code to change the job code to 501...Ch. 7 - Write the SQL code to delete the row for William...Ch. 7 - Write the SQL code that will restore the data to...Ch. 7 - Write the SQL code to create a copy of EMP_1,...Ch. 7 - Write the SQL code to change the EMP_PCT value to...Ch. 7 - Using a single command sequence, write the SQL...Ch. 7 - Prob. 11PCh. 7 - Write the SQL code that will change the PROJ_NUM...Ch. 7 - Write the two SQL command sequences required to:...Ch. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - Using the EMPLOYEE, JOB, and PROJECT tables in the...Ch. 7 - Write the SQL code that will produce the same...Ch. 7 - Write the SQL code to find the average bonus...Ch. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Write the SQL code to calculate the ASSIGN_CHARGE...Ch. 7 - Using the data in the ASSIGNMENT table, write the...Ch. 7 - Prob. 23PCh. 7 - Write the SQL code to generate the total hours...Ch. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - Generate a listing of all purchases made by the...Ch. 7 - Using the output shown in Figure P7.29 as your...Ch. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Use a query to compute the average purchase amount...Ch. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Using the results of the query created in Problem...Ch. 7 - Create a query to find the balance characteristics...Ch. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Write a query to display the SKU (stock keeping...Ch. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - Prob. 55PCh. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Prob. 68PCh. 7 - Prob. 69PCh. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - Prob. 73PCh. 7 - Prob. 74PCh. 7 - Prob. 75PCh. 7 - Prob. 76PCh. 7 - Prob. 77PCh. 7 - Prob. 78PCh. 7 - Prob. 79PCh. 7 - Prob. 80PCh. 7 - Prob. 81PCh. 7 - Prob. 82PCh. 7 - Prob. 83PCh. 7 - Prob. 84PCh. 7 - Prob. 85PCh. 7 - Prob. 86PCh. 7 - Prob. 87PCh. 7 - Prob. 88PCh. 7 - Prob. 89PCh. 7 - Prob. 90PCh. 7 - Prob. 91PCh. 7 - Prob. 92PCh. 7 - Prob. 93PCh. 7 - Prob. 94PCh. 7 - Prob. 95PCh. 7 - Write the SQL code to create the table structures...Ch. 7 - The following tables provide a very small portion...Ch. 7 - Write the SQL command to save the rows inserted in...Ch. 7 - Write the SQL command to change the movie year for...Ch. 7 - Prob. 100CCh. 7 - Prob. 101CCh. 7 - Prob. 102CCh. 7 - Prob. 103CCh. 7 - Prob. 104CCh. 7 - Prob. 105CCh. 7 - Prob. 106CCh. 7 - Prob. 107CCh. 7 - Prob. 108CCh. 7 - Prob. 109CCh. 7 - Prob. 110CCh. 7 - Prob. 111CCh. 7 - Prob. 112CCh. 7 - Prob. 113CCh. 7 - Prob. 114CCh. 7 - Prob. 115CCh. 7 - Prob. 116CCh. 7 - Prob. 117CCh. 7 - Prob. 118CCh. 7 - Prob. 119CCh. 7 - Prob. 120CCh. 7 - Prob. 121CCh. 7 - Prob. 122CCh. 7 - Prob. 123CCh. 7 - Prob. 124CCh. 7 - Write a query to display the movie number, movie...
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