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+-- Exercise 1: Normalize a Blog Database
+
+DROP TABLE IF EXISTS blog_posts;
+DROP TABLE IF EXISTS authors;
+
+CREATE TABLE authors (
+                         id INT PRIMARY KEY,
+                         name VARCHAR(100) NOT NULL UNIQUE
+);
+
+CREATE TABLE blog_posts (
+                            id INT PRIMARY KEY,
+                            author_id INT NOT NULL,
+                            title VARCHAR(100) NOT NULL,
+                            word_count INT NOT NULL,
+                            views INT NOT NULL,
+                            FOREIGN KEY (author_id) REFERENCES authors(id)
+);
+
+INSERT INTO authors (id, name) VALUES
+                                   (1, 'Maria Charlotte'),
+                                   (2, 'Juan Perez'),
+                                   (3, 'Gemma Alcocer');
+
+INSERT INTO blog_posts (id, author_id, title, word_count, views) VALUES
+                                                                     (1, 1, 'Best Paint Colors', 814, 14),
+                                                                     (2, 2, 'Small Space Decorating Tips', 1146, 221),
+                                                                     (3, 1, 'Hot Accessories', 986, 105),
+                                                                     (4, 1, 'Mixing Textures', 765, 22),
+                                                                     (5, 2, 'Kitchen Refresh', 1242, 307),
+                                                                     (6, 1, 'Homemade Art Hacks', 1002, 193),
+                                                                     (7, 3, 'Refinishing Wood Floors', 1571, 7542);
+
+
+-- Exercise 2: Normalize an Airline Database
+
+DROP TABLE IF EXISTS bookings;
+DROP TABLE IF EXISTS flights;
+DROP TABLE IF EXISTS customers;
+DROP TABLE IF EXISTS aircrafts;
+
+CREATE TABLE aircrafts (
+                           id INT PRIMARY KEY,
+                           name VARCHAR(100) NOT NULL,
+                           total_seats INT NOT NULL
+);
+
+CREATE TABLE flights (
+                         flight_number VARCHAR(20) PRIMARY KEY,
+                         aircraft_id INT NOT NULL,
+                         mileage INT NOT NULL,
+                         FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE customers (
+                           id INT PRIMARY KEY,
+                           name VARCHAR(100) NOT NULL,
+                           status VARCHAR(20) NOT NULL,
+                           total_mileage INT NOT NULL
+);
+
+CREATE TABLE bookings (
+                          id INT PRIMARY KEY,
+                          customer_id INT NOT NULL,
+                          flight_number VARCHAR(20) NOT NULL,
+                          FOREIGN KEY (customer_id) REFERENCES customers(id),
+                          FOREIGN KEY (flight_number) REFERENCES flights(flight_number)
+);
+
+INSERT INTO aircrafts (id, name, total_seats) VALUES
+                                                  (1, 'Boeing 747', 400),
+                                                  (2, 'Airbus A330', 236),
+                                                  (3, 'Boeing 777', 264);
+
+INSERT INTO flights (flight_number, aircraft_id, mileage) VALUES
+                                                              ('DL143', 1, 135),
+                                                              ('DL122', 2, 4370),
+                                                              ('DL53', 3, 2078),
+                                                              ('DL222', 3, 1765),
+                                                              ('DL37', 1, 531);
+
+INSERT INTO customers (id, name, status, total_mileage) VALUES
+                                                            (1, 'Agustine Riviera', 'Silver', 115235),
+                                                            (2, 'Alaina Sepulvida', 'None', 6008),
+                                                            (3, 'Tom Jones', 'Gold', 205767),
+                                                            (4, 'Sam Rio', 'None', 2653),
+                                                            (5, 'Jessica James', 'Silver', 127656),
+                                                            (6, 'Ana Janco', 'Silver', 136773),
+                                                            (7, 'Jennifer Cortez', 'Gold', 300582),
+                                                            (8, 'Christian Janco', 'Silver', 14642);
+
+INSERT INTO bookings (id, customer_id, flight_number) VALUES
+                                                          (1, 1, 'DL143'),
+                                                          (2, 1, 'DL122'),
+                                                          (3, 2, 'DL122'),
+                                                          (4, 1, 'DL143'),
+                                                          (5, 3, 'DL122'),
+                                                          (6, 3, 'DL53'),
+                                                          (7, 1, 'DL143'),
+                                                          (8, 4, 'DL143'),
+                                                          (9, 1, 'DL143'),
+                                                          (10, 3, 'DL222'),
+                                                          (11, 5, 'DL143'),
+                                                          (12, 4, 'DL143'),
+                                                          (13, 6, 'DL222'),
+                                                          (14, 7, 'DL222'),
+                                                          (15, 5, 'DL122'),
+                                                          (16, 4, 'DL37'),
+                                                          (17, 8, 'DL222');
+
+
+-- Exercise 3: SQL Queries
+
+-- Total number of flights
+SELECT COUNT(DISTINCT flight_number) FROM flights;
+
+-- Average flight distance
+SELECT AVG(mileage) FROM flights;
+
+-- Average number of seats per aircraft
+SELECT AVG(total_seats) FROM aircrafts;
+
+-- Average miles flown by customers, grouped by status
+SELECT status, AVG(total_mileage)
+FROM customers
+GROUP BY status;
+
+-- Max miles flown by customers, grouped by status
+SELECT status, MAX(total_mileage)
+FROM customers
+GROUP BY status;
+
+-- Number of aircrafts with Boeing in their name
+SELECT COUNT(*)
+FROM aircrafts
+WHERE name LIKE '%Boeing%';
+
+-- Flights with distance between 300 and 2000 miles
+SELECT *
+FROM flights
+WHERE mileage BETWEEN 300 AND 2000;
+
+-- Average flight distance booked, grouped by customer status
+SELECT c.status, AVG(f.mileage)
+FROM bookings b
+         JOIN customers c ON b.customer_id = c.id
+         JOIN flights f ON b.flight_number = f.flight_number
+GROUP BY c.status;
+
+-- Most booked aircraft among Gold status members
+SELECT a.name, COUNT(*) AS total_bookings
+FROM bookings b
+         JOIN customers c ON b.customer_id = c.id
+         JOIN flights f ON b.flight_number = f.flight_number
+         JOIN aircrafts a ON f.aircraft_id = a.id
+WHERE c.status = 'Gold'
+GROUP BY a.name
+ORDER BY total_bookings DESC
+    LIMIT 1;
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