SQL HW

Module_1_Common/SQL/courses.sql

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+-- Курсы
+CREATE TABLE courses (
+    course_id SERIAL PRIMARY KEY,
+    course_name VARCHAR(255) NOT NULL,
+    description TEXT,
+    start_date DATE,
+    end_date DATE
+);
+
+-- Студенты
+CREATE TABLE students (
+    student_id SERIAL PRIMARY KEY,
+    first_name VARCHAR(255) NOT NULL,
+    last_name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    date_of_birth DATE
+);
+
+-- Уроки
+CREATE TABLE lessons (
+    lesson_id SERIAL PRIMARY KEY,
+    lesson_name VARCHAR(255) NOT NULL,
+    content TEXT,
+    video_url VARCHAR(255),
+    lesson_order INT
+);
+
+-- m2m students to courses
+CREATE TABLE student_courses (
+    student_id INT REFERENCES students(student_id),
+    course_id INT REFERENCES courses(course_id),
+    enrollment_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (student_id, course_id)
+);

Module_1_Common/SQL/market.sql

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+-- Товары
+CREATE TABLE products (
+    product_id INT PRIMARY KEY AUTO_INCREMENT,
+    product_name VARCHAR(255) NOT NULL,
+    description TEXT,
+    price DECIMAL(10, 2) NOT NULL,
+    stock_quantity INT NOT NULL
+);
+
+-- Клиенты
+CREATE TABLE customers (
+    customer_id INT PRIMARY KEY AUTO_INCREMENT,
+    first_name VARCHAR(255) NOT NULL,
+    last_name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL
+);
+
+-- Заказы
+CREATE TABLE orders (
+    order_id INT PRIMARY KEY AUTO_INCREMENT,
+    customer_id INT,
+    order_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    total_amount DECIMAL(10, 2) NOT NULL,
+    status VARCHAR(50) DEFAULT 'В обработке',
+    FOREIGN KEY (customer_id) REFERENCES customers(customer_id)
+);
+
+-- Товары в заказах
+CREATE TABLE order_items (
+    order_item_id INT PRIMARY KEY AUTO_INCREMENT,
+    order_id INT,
+    product_id INT,
+    quantity INT NOT NULL,
+    subtotal DECIMAL(10, 2) NOT NULL,
+    FOREIGN KEY (order_id) REFERENCES orders(order_id),
+    FOREIGN KEY (product_id) REFERENCES products(product_id)
+);
+

Module_1_Common/SQL/sn.sql

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+-- Пользователи
+CREATE TABLE users (
+    user_id SERIAL PRIMARY KEY,
+    username VARCHAR(255) UNIQUE NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    full_name VARCHAR(255),
+    date_joined TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Посты
+CREATE TABLE posts (
+    post_id SERIAL PRIMARY KEY,
+    user_id INT REFERENCES users(user_id),
+    content TEXT NOT NULL,
+    post_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Комментарии
+CREATE TABLE comments (
+    comment_id SERIAL PRIMARY KEY,
+    user_id INT REFERENCES users(user_id),
+    post_id INT REFERENCES posts(post_id),
+    content TEXT NOT NULL,
+    comment_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Лайки
+CREATE TABLE likes (
+    like_id SERIAL PRIMARY KEY,
+    user_id INT REFERENCES users(user_id),
+    post_id INT REFERENCES posts(post_id),
+    comment_id INT REFERENCES comments(comment_id),
+    like_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Друзья
+CREATE TABLE friends (
+    friendship_id SERIAL PRIMARY KEY,
+    user1_id INT REFERENCES users(user_id),
+    user2_id INT REFERENCES users(user_id),
+    friendship_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);

Module_1_Common/SQL/todo.sql

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+CREATE TABLE categories (
+    category_id INT PRIMARY KEY AUTO_INCREMENT,
+    category_name VARCHAR(255) NOT NULL
+);
+
+CREATE TABLE tasks (
+    task_id INT PRIMARY KEY AUTO_INCREMENT,
+    task_name VARCHAR(255) NOT NULL,
+    description TEXT,
+    due_date DATE,
+    category_id INT,
+    completed BOOLEAN DEFAULT FALSE,
+    FOREIGN KEY (category_id) REFERENCES categories(category_id)
+);
+
+INSERT INTO categories (category_name) VALUES ('Работа'), ('Дом'), ('Личное');