Database Design

1. Tables:

• Users: Contains information about the users participating in the tutorial. Example columns: user_id, username, email, password.
• Courses: Stores details about the SQL courses offered in the tutorial. Example columns: course_id, course_name, description.
• Lessons: Represents individual lessons within a course. Example columns: lesson_id, course_id (foreign key), lesson_title, lesson_content.
• Quiz: Stores quiz questions related to a lesson. Example columns: quiz_id, lesson_id (foreign key), question, option1, option2, option3, option4, correct_answer.
• Userprogress: Tracks the progress of users in completing lessons and quizzes. Example columns: user_id (foreign key), lesson_id (foreign key), quiz_id (foreign key), completed.

2. Relationships:

 

• Users and Courses: Many-to-many relationship. A user can enroll in multiple courses, and a course can have multiple users enrolled. Use a junction table to represent this relationship, e.g., Enrollment: user_id (foreign key), course_id (foreign key).
• Courses and Lessons: One-to-many relationship. A course can have multiple lessons, but a lesson belongs to only one course.
• Lessons and Quiz: One-to-many relationship. A lesson can have multiple quiz questions, but a quiz question belongs to only one lesson.
• Users and userprogress: One-to-many relationship. A user can have multiple progress entries, but each progress entry corresponds to only one user.

 

Database Design

To create a database for an SQL project, you would typically use a database management system (DBMS) such as MySQL, PostgreSQL, or SQLite. Here’s an example of how you can create the database using MySQL:

1. Start by creating the database itself. Open the command-line interface or a database management tool and execute the following SQL statement:

CREATE DATABASE sql_tutorial;

2. Once the database is created, switch to using it:

USE sql_tutorial;

3. Next, create the necessary tables. Execute the following SQL statements to create the tables and define their columns:

— Users table

CREATE TABLE Users (

  user_id INT PRIMARY KEY AUTO_INCREMENT,

  username VARCHAR(50) NOT NULL,

  email VARCHAR(100) NOT NULL,

  password VARCHAR(100) NOT NULL

);

— Courses table

CREATE TABLE Courses (

  course_id INT PRIMARY KEY AUTO_INCREMENT,

  course_name VARCHAR(100) NOT NULL,

  description VARCHAR(255)

);

— Lessons table

CREATE TABLE Lessons (

  lesson_id INT PRIMARY KEY AUTO_INCREMENT,

  course_id INT NOT NULL,

  lesson_title VARCHAR(100) NOT NULL,

  lesson_content TEXT,

  FOREIGN KEY (course_id) REFERENCES Courses(course_id)

);

— Quiz table

CREATE TABLE Quiz (

  quiz_id INT PRIMARY KEY AUTO_INCREMENT,

  lesson_id INT NOT NULL,

  question TEXT NOT NULL,

  option1 VARCHAR(255) NOT NULL,

  option2 VARCHAR(255) NOT NULL,

  option3 VARCHAR(255) NOT NULL,

  option4 VARCHAR(255) NOT NULL,

  correct_answer INT NOT NULL,

  FOREIGN KEY (lesson_id) REFERENCES Lessons(lesson_id)

);

— UserProgress table

CREATE TABLE UserProgress (

  user_id INT NOT NULL,

  lesson_id INT NOT NULL,

  quiz_id INT NOT NULL,

  completed BOOLEAN,

  FOREIGN KEY (user_id) REFERENCES Users(user_id),

  FOREIGN KEY (lesson_id) REFERENCES Lessons(lesson_id),

  FOREIGN KEY (quiz_id) REFERENCES Quiz(quiz_id)

);

4. With the tables created, your SQL tutorial database is ready for use. You can now start populating the tables with data and execute SQL queries to demonstrate various concepts during the tutorial.

 

Data Manipulation

In an SQL project, data manipulation is an essential aspect to cover various concepts and techniques. Here are some examples of data manipulation operations that you can demonstrate in your SQL PROJECT:

1. Data Insertion:

• Insert a new user into the Users table:

INSERT INTO Users (username, email, password) VALUES (‘JohnDoe’, ‘johndoe@example.com’, ‘password123’);

• Add a new course to the Courses table:

INSERT INTO Courses (course_name, description) VALUES (‘SQL Basics’, ‘Introduction to SQL fundamentals’);

2. Data Updating:

• Update the email address of a specific user:

UPDATE Users SET email = ‘newemail@example.com’ WHERE user_id = 1;

• Modify the course description:

UPDATE Courses SET description = ‘Learn the basics of SQL queries and database management’ WHERE course_id = 1;

3. Data Deletion:

 

• Remove a user from the Users table:

DELETE FROM Users WHERE user_id = 2;

• Delete a specific lesson from the Lessons table:

DELETE FROM Lessons WHERE lesson_id = 5;

4. Data Retrieval:

• Retrieve all users from the Users table:

SELECT * FROM Users;

• Get the details of a specific course:

SELECT * FROM Courses WHERE course_id = 1;

• Retrieve all completed lessons for a user:

SELECT Lessons.lesson_title FROM Lessons

INNER JOIN UserProgress ON Lessons.lesson_id = UserProgress.lesson_id

WHERE UserProgress.user_id = 1 AND UserProgress.completed = TRUE;