Module 4: Final project and assessment: Data structures and algorithms

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In this post, I provide accurate answers and detailed explanations for Module 4: Final project and assessment: Data structures and algorithms of Course 4: Database Management with Java and SQL – Amazon Junior Software Developer Professional Certificate.

Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question.

Course quiz: Database management with Java and SQL

Graded Assignment

1. Which of the following are the primary functions of a database? Select all that apply.

  • Storing data
  • Retrieving data
  • Backing up data
  • Managing data

Explanation:
Databases are designed to store, retrieve, and manage data. Backing up data is an optional functionality provided by specific database tools or services.

2. Which of the following statements accurately describes a relational database?

  • A relational databaseorganizes data in key-value pairs and is ideal for handling unstructured data.
  • A relational database organizes data into tables that can relate to each other, ensuring data integrity and supporting complex queries.
  • A relational database uses a flexible schema to accommodate varying data types and structures.
  • A relational database is designed primarily for high-speed operations without any concern for data integrity.

Explanation:
Relational databases use a structured schema with tables that relate to each other via foreign keys, making them ideal for structured data and complex queries.

3. What is an atomic value in the context of relational databases?

  • A value that represents multiple entries in a field.
  • A type of record that has a complex structure.
  • A single, indivisible value contained in a field of a record.
  • A value that can be divided into multiple values.

Explanation:
Atomic values in relational databases are the smallest unit of data stored in a single field, ensuring normalization principles.

4. You are working on a database for an online education platform. The platform has two main tables: Courses and Instructors. Each Instructor can teach multiple courses, but each course is assigned only one instructor. You're designing the database to reflect this relationship accurately.

True or False. In this situation, the relationship between Courses and Instructors tables is One-to-Many?

  • True
  • False

Explanation:
Each course has only one instructor, but an instructor can teach multiple courses. This describes a One-to-Many relationship.

5. Which of the following are valid aggregate functions in SQL? Select all that apply.

  • MAX
  • COUNT
  • MEDIAN
  • AVG

Explanation:
SQL aggregate functions include MAX, COUNT, and AVG. MEDIAN is not a standard SQL aggregate function but may be available in certain extensions.

6. Which SQL join type returns all matching rows from both tables and null for non-matching rows?

  • FULL OUTER JOIN
  • RIGHT JOIN
  • LEFT JOIN
  • INNER JOIN

Explanation:
A FULL OUTER JOIN combines results from both tables, including unmatched rows, filling gaps with NULL.

7. Examine the following Java code snippet for connecting to a database using JDBC:

True or False: The code will successfully establish a connection only if the MySQL JDBC Driver JAR is included in the project's classpath.

  • True
  • False

Explanation:
The MySQL JDBC Driver must be available in the classpath for the code to connect to the database.

8. The following SQL statement is used to permanently remove the employees table from the database:

What is wrong with the SQL statement?

  • The statement should be ERASE TABLE employees.
  • The statement should be DELETE TABLE employees.
  • There’s nothing wrong with the statement.
  • The statement should be DROP TABLE employees.

Explanation:
The correct SQL command for permanently removing a table is DROP TABLE, not REMOVE TABLE.

9. Consider the following SQL query to classify sales into two categories. Which clause should replace the missing part of the code?

  • RETURN
  • SET
  • WHEN
  • IF

Explanation:
The WHEN clause is used in a CASE statement to define conditions.

10. Which of the following is NOT a typical step in creating a new JavaFX project?

  • Setting up the project structure
  • Adding JavaFX dependencies
  • Creating the main application class
  • Compiling the database schema

Explanation:
JavaFX projects focus on UI development, while database schema compilation is related to database management.

11. True or False: In JavaFX, event handlers are used to respond to user interactions with UI elements.

  • True
  • False

Explanation:
Event handlers in JavaFX are designed to manage user interactions with UI components.

12. Which of the following are essential components or methods required to display and search user data in a TableView in a JavaFX application? Select all that apply.

  • PredicateProperty() method
  • setCellValueFactory() method
  • TextField
  • ObservableList

Explanation:
To display and search data in a TableView, an ObservableList stores the data, setCellValueFactory() binds table columns to properties, and a TextField is typically used for search input.

13. In the following JavaFX code, a TextFieldis bound to a Label so that any text typed in the TextFieldis dynamically reflected in the Label. Which line is missing to complete the binding setup?

  • nameText.setText(nameProperty.getValue());
  • nameProperty.bind(nameText.textProperty());
  • nameProperty.bindBidirectional(nameText.textProperty());
  • nameProperty.bind(nameLabel.textProperty());

Explanation:
The bindBidirectional() method ensures that changes in the TextField and the Label are reflected in both directions.

14. You are tasked with designing a JavaFX application for managing learner details using a GUI. Which of the following JavaFX containers should you use to ensure that your UI elements are positioned relative to specific edges of the application window, maintaining their locations even when the window is resized?

  • VBox
  • HBox
  • GridPane
  • AnchorPane

Explanation:
AnchorPane allows precise positioning of UI elements relative to the edges of the window, adapting dynamically to resizing.

15. Which of the following methods are part of the TableViewSelectionModel in JavaFX? Select all that apply.

  • setSelectedItems()
  • getSelectedItem()
  • setSelectionMode()
  • getSelectedIndex()

Explanation:
TableViewSelectionModel provides methods to manage and retrieve selection information. setSelectedItems() is not a valid method.

Related contents:

Module 1: Introduction to databases
Module 2: Databases and Java
Module 3: Displaying data

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