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+-- EXERCISE 1:
+CREATE DATABASE blog;
+
+USE blog;
+
+CREATE TABLE authors 
+(
+	id  INT auto_increment PRIMARY KEY,
+    name VARCHAR(50) NOT NULL
+);
+
+CREATE TABLE blogs
+(
+	id INT auto_increment PRIMARY KEY,
+    title VARCHAR(100) NOT NULL UNIQUE,
+    word_count INT NOT NULL,
+    views INT NOT NULL DEFAULT 0,
+    author_id INT NOT NULL,
+    CONSTRAINT fk_author FOREIGN KEY (author_id) REFERENCES authors(id) ON DELETE CASCADE
+);
+
+INSERT INTO authors (name) 
+VALUES 
+	('Maria Charlotte'),
+	('Juan Perez'),
+	('Gemma Alcocer') ;
+    
+INSERT INTO blogs (title,word_count,views,author_id)
+VALUES
+	('Best Paint Colors',              814,          14,1),
+    ('Small Space Decorating Tips',    1146,         221,2),
+    ('Hot Accessories',                986,          105,1),
+    ('Mixing Textures',                765,          22,1),
+    ('Kitchen Refresh',                1242,         307,2),
+    ('Homemade Art Hacks',             1002,         193,1),
+    ('Refinishing Wood Floors',        1571,         7542,3);
+    
+SELECT a.name,b.title,b.word_count,b.views
+FROM blogs b
+JOIN authors a ON b.author_id=a.id
+ORDER BY b.views;
+
+-- Exercise 2:
+CREATE DATABASE airline;
+
+USE airline;
+
+CREATE TABLE customers
+(
+	id 	INT auto_increment PRIMARY KEY,
+    name VARCHAR(50) NOT NULL,
+    status ENUM('Gold','Silver','None') DEFAULT 'None',
+    total_mileage INT NOT NULL
+);
+
+CREATE TABLE aircrafts
+(
+	id INT auto_increment PRIMARY KEY,
+    name VARCHAR(30) NOT NULL,
+    total_seats INT NOT NULL
+);
+
+CREATE TABLE flights
+(
+    flight_number VARCHAR(20) PRIMARY KEY,
+    mileage INT NOT NULL,
+    aircraft_id INT NOT NULL,
+    FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE bookings
+(
+	id INT auto_increment PRIMARY KEY,
+    customer_id INT NOT NULL,
+    FOREIGN KEY (customer_id) REFERENCES customers(id),
+    flight_number VARCHAR(20) NOT NULL,
+    FOREIGN KEY (flight_number) REFERENCES flights(flight_number),
+    UNIQUE(customer_id,flight_number)
+);
+
+INSERT INTO customers (name,status,total_mileage)
+VALUES 
+	('Agustine Riviera','Silver',115235),
+	('Alaina Sepulvida','None',6008),
+	('Tom Jones','Gold',205767),
+	('Sam Rio','None',2653),
+	('Jessica James','Silver',127656),
+	('Ana Janco','Silver',136773),
+	('Jennifer Cortez','Gold',300582),
+	('Christian Janco','Silver',14642);
+
+
+INSERT INTO aircrafts (name,total_seats)
+VALUES
+	('Boeing 747',400),
+	('Airbus A330',236),
+	('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 bookings (customer_id,flight_number)
+VALUES 
+(1, 'DL143'),
+(1, 'DL122'),
+(3, 'DL122'),
+(3, 'DL53'),
+(4, 'DL143'),
+(3, 'DL222'),
+(5, 'DL143'),
+(6, 'DL222'),
+(7, 'DL222'),
+(5, 'DL122'),
+(4, 'DL37'),
+(8, 'DL222');
+
+SELECT 
+c.name AS 'Customer Name', 
+c.status AS 'Customer Status',
+f.flight_number AS 'Flight Number',
+a.name AS 'Aircraft',
+a.total_seats AS 'Total Aircraft Seats',
+f.mileage AS 'Flight Mileage',
+c.total_mileage AS 'Total Customer Mileage'
+FROM bookings b
+JOIN customers c ON b.customer_id=c.id
+JOIN flights f ON f.flight_number=b.flight_number
+JOIN aircrafts a ON a.id=f.aircraft_id;
+
+
+-- Exercise 3:
+SELECT COUNT(DISTINCT flight_number) FROM flights;
+
+SELECT AVG(mileage) FROM flights;
+
+SELECT AVG(total_seats) FROM aircrafts;
+
+SELECT status, AVG(total_mileage) FROM customers GROUP BY status;
+
+SELECT status, MAX(total_mileage) FROM customers GROUP BY status;
+
+SELECT COUNT(*) FROM aircrafts WHERE name LIKE '%Boeing%';
+
+SELECT * FROM flights WHERE mileage BETWEEN 300 AND 2000;
+
+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;
+
+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;