Purpose of an E-R model:

Entity-Relationship Model (ERM) is used as a high-level logical data model depicted in the form of picture and it contains the information about the business system.

The information can be created and stored in the form of ERM diagram.

It is used to identify the individual information and the way they are interrelated in the business system.

The main purpose of E-R model is to identify the entities about which the database should store data and the relationships among those entities.

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Chapter 1, Problem 2RQ

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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 1 Solutions

Oracle 12c: SQL

Ch. 1 - Prob. 1RQ Ch. 1 - Prob. 2RQ Ch. 1 - Prob. 3RQ Ch. 1 - Prob. 4RQ Ch. 1 - Discuss the problems that can be caused by data...Ch. 1 - Explain the role of a primary key.Ch. 1 - Prob. 7RQ Ch. 1 - Prob. 8RQ Ch. 1 - What type of relationship can’t be stored in a...Ch. 1 - Identify at least three reasons an organization...

Ch. 1 - Prob. 1MC Ch. 1 - Prob. 2MC Ch. 1 - Prob. 3MC Ch. 1 - Prob. 4MC Ch. 1 - Prob. 5MC Ch. 1 - Prob. 6MC Ch. 1 - Prob. 7MC Ch. 1 - Which of the following has no partial or...Ch. 1 - Prob. 9MC Ch. 1 - Which of the following has no partial dependencies...Ch. 1 - Which of the following has no repeating groups but...Ch. 1 - Prob. 12MC Ch. 1 - Prob. 13MC Ch. 1 - A unique identifier for a data row that consists...Ch. 1 - Which of the following symbols represents an...Ch. 1 - Prob. 16MC Ch. 1 - Which of the following represents a field in a...Ch. 1 - Which of the following defines a relationship in...Ch. 1 - When part of the data in a table depends on a...Ch. 1 - Which of the following is used to join data...Ch. 1 - Which tables and fields would you access to...Ch. 1 - Prob. 2HOA Ch. 1 - Prob. 3HOA Ch. 1 - Prob. 4HOA Ch. 1 - Access path A database table is composed of...Ch. 1 - Prob. 6HOA Ch. 1 - Prob. 7HOA Ch. 1 - Prob. 8HOA Ch. 1 - Prob. 9HOA Ch. 1 - Prob. 10HOA

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