Exercise 1 done

solutions.sql

@@ -0,0 +1,165 @@
+CREATE DATABASE IF NOT EXISTS airport;
+USE airport;
+
+-- EXERCISE 1 --
+#First we should add a PRIMARY KEY and then split the tables.
+
+CREATE TABLE IF NOT EXISTS authors (
+	id INT AUTO_INCREMENT PRIMARY KEY,
+    full_name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS blogs (
+	id INT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(100) NOT NULL,
+    word_count INT NOT NULL,
+    views BIGINT NOT NULL,
+    author_id INT NOT NULL,
+    CONSTRAINT fk_author_blog FOREIGN KEY (author_id) REFERENCES authors(id)
+);
+
+INSERT INTO authors (full_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 Wood Hacks', 1002, 193, 1),
+    ('Refinishing Wood Floors', 1571, 7542, 3);
+
+
+
+-- EXERCISE 2 --
+#Again we should add Primary Keys and separate tables.
+CREATE TABLE IF NOT EXISTS aircrafts (
+	id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    total_seats INT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS customers (
+	id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(200) NOT NULL,
+    status ENUM('GOLD', 'SILVER', 'NONE') DEFAULT 'NONE',
+    total_mileage BIGINT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS flights (
+	flight_number VARCHAR(20) NOT NULL PRIMARY KEY,
+    aircraft_id INT NOT NULL,
+    mileage INT NOT NULL,
+    CONSTRAINT fk_flight_aircraft FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE IF NOT EXISTS bookings (
+	id INT AUTO_INCREMENT PRIMARY KEY,
+    customer_id INT NOT NULL,
+    flight_number VARCHAR(20) NOT NULL,
+    CONSTRAINT fk_booking_flight FOREIGN KEY (flight_number) REFERENCES flights(flight_number),
+    CONSTRAINT fk_booking_customer FOREIGN KEY (customer_id) REFERENCES customers(id) 
+);
+
+
+INSERT INTO aircrafts (name, total_seats) 
+VALUES
+	('Boeing 747', 400),
+	('Airbus A330', 236),
+	('Boeing 777', 264);
+
+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 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'),
+	(2, 'DL122'),
+	(1, 'DL143'),
+	(3, 'DL122'),
+	(3, 'DL53'),
+	(1, 'DL143'),
+	(4, 'DL143'),
+	(1, 'DL143'),
+	(3, 'DL222'),
+	(5, 'DL143'),
+	(4, 'DL143'),
+	(6, 'DL222'),
+	(7, 'DL222'),
+	(5, 'DL122'),
+	(4, 'DL37'),
+	(8, 'DL222');
+
+-- EXERCISE 3 --
+
+-- 1 --
+SELECT COUNT(*) AS flight_count FROM flights;
+
+-- 2 --
+SELECT AVG(mileage) AS average_mileage FROM flights;
+
+-- 3 --
+SELECT AVG(total_seats) AS average_seats FROM aircrafts;
+
+-- 4 --
+SELECT status, AVG(total_mileage) AS average_mileage FROM customers
+GROUP BY status;
+
+-- 5 --
+SELECT status, MAX(total_mileage) AS max_mileage FROM customers
+GROUP BY status;
+
+-- 6 --
+SELECT COUNT(*) AS count FROM aircrafts
+WHERE name LIKE '%Boeing%';
+
+-- 7 --
+SELECT * FROM flights
+WHERE mileage BETWEEN 300 AND 2000;
+
+-- 8 --
+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;
+
+-- 9 --
+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;
+
+
+
+
+
+