lab-normalization

lab_exercises/Exercise_1.sql

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+USE ironhack ;
+CREATE TABLE IF NOT EXISTS author(
+id INT AUTO_INCREMENT PRIMARY KEY,
+name VARCHAR(100) NOT NULL UNIQUE
+);
+
+
+CREATE TABLE IF NOT
+ EXISTS posts(
+id INT AUTO_INCREMENT 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 author(id)
+);
+
+
+INSERT INTO author (name) VALUES 
+('Maria Charlotte'),
+('Juan Perez'),
+('Gemma Alcocer');
+
+INSERT INTO posts (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);
+

lab_exercises/Exercise_2.sql

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+-- 1. WIPE THE OLD TABLES (Must  be in this order due to foreign keys)
+DROP TABLE IF EXISTS bookings;
+DROP TABLE IF EXISTS flights;
+DROP TABLE IF EXISTS aircrafts;
+DROP TABLE IF EXISTS customers;
+
+-- 2. CREATE ADJUSTED TABLES
+CREATE TABLE customers(
+id INT AUTO_INCREMENT PRIMARY KEY,
+name VARCHAR(1000) NOT NULL,
+status  VARCHAR(100) NOT NULL,
+total_mileage INT NOT NULL
+);
+
+CREATE TABLE aircrafts(
+id INT AUTO_INCREMENT PRIMARY KEY,
+name VARCHAR(100) NOT NULL,
+total_seats  INT NOT NULL
+);
+
+CREATE TABLE flights(
+id INT AUTO_INCREMENT PRIMARY KEY,
+flight_number VARCHAR(100) NOT NULL,
+mileage INT NOT NULL,
+aircraft_id INT NOT NULL,
+FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE bookings (
+booking_id INT AUTO_INCREMENT PRIMARY KEY,
+customer_id INT NOT NULL,
+flight_number VARCHAR(100) NOT NULL,
+FOREIGN KEY (customer_id) REFERENCES customers(id)
+);
+
+
+
+-- 3. INSERT ADJUSTE DATA
+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 , mileage, aircraft_id) VALUES
+('DL143', 135, 1),
+('DL122', 4370, 2),
+('DL53', 2078, 3),
+('DL222', 1765, 3),
+('DL37', 531, 1);
+
+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');

lab_exercises/Exercise_3.sql

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+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;