|
|
|
|
|
|
|
|
|
|
| CREATE TABLE users (
|
| id SERIAL PRIMARY KEY,
|
| name VARCHAR(100) NOT NULL,
|
| email VARCHAR(100) UNIQUE NOT NULL,
|
| created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
|
| );
|
|
|
|
|
| INSERT INTO users (name, email) VALUES
|
| ('John Doe', 'john.doe@example.com'),
|
| ('Jane Smith', 'jane.smith@example.com'),
|
| ('Bob Johnson', 'bob.johnson@example.com'),
|
| ('Alice Williams', 'alice.williams@example.com'),
|
| ('Charlie Brown', 'charlie.brown@example.com');
|
|
|
|
|
| CREATE TABLE products (
|
| id SERIAL PRIMARY KEY,
|
| product_name VARCHAR(200) NOT NULL,
|
| price DECIMAL(10, 2) NOT NULL,
|
| stock_quantity INTEGER DEFAULT 0,
|
| created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
|
| );
|
|
|
|
|
| INSERT INTO products (product_name, price, stock_quantity) VALUES
|
| ('Laptop', 999.99, 50),
|
| ('Mouse', 29.99, 200),
|
| ('Keyboard', 79.99, 150),
|
| ('Monitor', 299.99, 75),
|
| ('Headphones', 149.99, 100);
|
|
|
|
|
| CREATE TABLE orders (
|
| id SERIAL PRIMARY KEY,
|
| user_id INTEGER REFERENCES users(id),
|
| product_id INTEGER REFERENCES products(id),
|
| quantity INTEGER NOT NULL,
|
| total_amount DECIMAL(10, 2) NOT NULL,
|
| order_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
|
| );
|
|
|
|
|
| INSERT INTO orders (user_id, product_id, quantity, total_amount) VALUES
|
| (1, 1, 1, 999.99),
|
| (2, 2, 2, 59.98),
|
| (3, 3, 1, 79.99),
|
| (4, 4, 1, 299.99),
|
| (5, 5, 2, 299.98);
|
|
|
|
|
| CREATE INDEX idx_users_email ON users(email);
|
| CREATE INDEX idx_products_name ON products(product_name);
|
| CREATE INDEX idx_orders_user_id ON orders(user_id);
|
| CREATE INDEX idx_orders_product_id ON orders(product_id);
|
|
|
|
|
|
|
|
|