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lab.sql

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+---Exercise 1:
+
+---Step 1:
+--- The raw dataset contains redundancy because author names are repeated for multiple posts.
+--- To normalize the data to 3NF, the schema is split into two tables:
+--- authors(author_id, author_name)
+--- articles(article_id, title, word_count, views, author_id)
+--- This removes repeated author data and links each article to its author using a foreign key.
+
+
+CREATE DATABASE IF NOT EXISTS blog;
+USE blog;
+
+CREATE TABLE IF NOT EXISTS authors (
+    author_id INT AUTO_INCREMENT PRIMARY KEY,
+    author_name VARCHAR(255) NOT NULL UNIQUE
+    );
+
+CREATE TABLE IF NOT EXISTS articles (
+    article_id INT AUTO_INCREMENT PRIMARY KEY,
+    author_id INT NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    word_count INT NOT NULL,
+    views INT NOT NULL DEFAULT 0,
+    CONSTRAINT fk_author_id FOREIGN KEY (author_id) REFERENCES authors(author_id)
+    );
+
+INSERT INTO authors (author_name) VALUES
+    ('Maria Charlotte'),
+    ('Juan Perez'),
+    ('Gemma Alcocer');
+
+INSERT INTO articles (title, word_count, views, author_id) VALUES
+    ('Best Paint Colors', 814, 14,
+    (SELECT author_id FROM authors WHERE author_name = 'Maria Charlotte')),
+
+    ('Small Space Decorating Tips', 1146, 221,
+    (SELECT author_id FROM authors WHERE author_name = 'Juan Perez')),
+
+    ('Hot Accessories', 986, 105,
+    (SELECT author_id FROM authors WHERE author_name = 'Maria Charlotte')),
+
+    ('Mixing Textures', 765, 22,
+    (SELECT author_id FROM authors WHERE author_name = 'Maria Charlotte')),
+
+    ('Kitchen Refresh', 1242, 307,
+    (SELECT author_id FROM authors WHERE author_name = 'Juan Perez')),
+
+    ('Homemade Art Hacks', 1002, 193,
+    (SELECT author_id FROM authors WHERE author_name = 'Maria Charlotte')),
+
+    ('Refinishing Wood Floors', 1571, 7542,
+    (SELECT author_id FROM authors WHERE author_name = 'Gemma Alcocer'));
+
+SELECT a.author_name,
+       ar.title,
+       ar.word_count,
+       ar.views
+FROM authors a
+JOIN articles ar ON a.author_id = ar.author_id
+ORDER BY ar.views DESC;
+
+---Exercise 2:
+
+-- The raw dataset contains repeated customer, flight, and aircraft information.
+-- To normalize the data to 3NF, it is decomposed into the following tables:
+-- customers, aircrafts, flights, bookings.
+
+-- Functional Dependencies:
+-- Customer Name -> Customer Status, Total Customer Mileage
+-- Aircraft -> Total Aircraft Seats
+-- Flight Number -> Aircraft, Flight Mileage
+
+-- 3NF Decomposition:
+-- customers(customer_id, customer_name, customer_status, total_customer_mileage)
+-- aircrafts(aircraft_id, aircraft, total_aircraft_seats)
+-- flights(flight_number, aircraft_id, flight_mileage)
+-- bookings(booking_id, customer_id, flight_number)
+
+CREATE DATABASE IF NOT EXISTS airline;
+USE airline;
+
+CREATE TABLE IF NOT EXISTS customers (
+    customer_id INT AUTO_INCREMENT PRIMARY KEY,
+    customer_name VARCHAR(255) NOT NULL UNIQUE,
+    customer_status VARCHAR(50) NOT NULL,
+    total_customer_mileage INT NOT NULL
+    );
+
+CREATE TABLE IF NOT EXISTS aircrafts (
+    aircraft_id INT AUTO_INCREMENT PRIMARY KEY,
+    aircraft VARCHAR(100) NOT NULL UNIQUE,
+    total_aircraft_seats INT NOT NULL
+    );
+
+CREATE TABLE IF NOT EXISTS flights (
+    flight_number VARCHAR(20) PRIMARY KEY,
+    aircraft_id INT NOT NULL,
+    flight_mileage INT NOT NULL,
+    CONSTRAINT fk_flights_aircraft FOREIGN KEY (aircraft_id) REFERENCES aircrafts(aircraft_id)
+    );
+
+CREATE TABLE IF NOT EXISTS bookings (
+    booking_id INT AUTO_INCREMENT PRIMARY KEY,
+    customer_id INT NOT NULL,
+    flight_number VARCHAR(20) NOT NULL,
+    CONSTRAINT fk_bookings_customer FOREIGN KEY (customer_id) REFERENCES customers(customer_id),
+    CONSTRAINT fk_bookings_flight FOREIGN KEY (flight_number) REFERENCES flights(flight_number)
+    );
+
+INSERT INTO aircrafts (aircraft, total_aircraft_seats) VALUES
+    ('Boeing 747', 400),
+    ('Airbus A330', 236),
+    ('Boeing 777', 264);
+
+INSERT INTO customers (customer_name, customer_status, total_customer_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, flight_mileage) VALUES
+    ('DL143',
+    (SELECT aircraft_id FROM aircrafts WHERE aircraft = 'Boeing 747'),
+    135),
+
+    ('DL122',
+    (SELECT aircraft_id FROM aircrafts WHERE aircraft = 'Airbus A330'),
+    4370),
+
+    ('DL53',
+    (SELECT aircraft_id FROM aircrafts WHERE aircraft = 'Boeing 777'),
+    2078),
+
+    ('DL222',
+    (SELECT aircraft_id FROM aircrafts WHERE aircraft = 'Boeing 777'),
+    1765),
+
+    ('DL37',
+    (SELECT aircraft_id FROM aircrafts WHERE aircraft = 'Boeing 747'),
+    531);
+
+INSERT INTO bookings (customer_id, flight_number) VALUES
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Agustine Riviera'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Agustine Riviera'), 'DL122'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Alaina Sepulvida'), 'DL122'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Agustine Riviera'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Tom Jones'), 'DL122'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Tom Jones'), 'DL53'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Agustine Riviera'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Sam Rio'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Agustine Riviera'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Tom Jones'), 'DL222'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Jessica James'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Sam Rio'), 'DL143'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Ana Janco'), 'DL222'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Jennifer Cortez'), 'DL222'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Jessica James'), 'DL122'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Sam Rio'), 'DL37'),
+
+    ((SELECT customer_id FROM customers WHERE customer_name = 'Christian Janco'), 'DL222');
+
+SELECT c.customer_name,
+       c.customer_status,
+       f.flight_number,
+       a.aircraft,
+       a.total_aircraft_seats,
+       f.flight_mileage,
+       c.total_customer_mileage
+FROM bookings b
+JOIN customers c ON b.customer_id = c.customer_id
+JOIN flights f ON b.flight_number = f.flight_number
+JOIN aircrafts a ON f.aircraft_id = a.aircraft_id
+ORDER BY c.customer_name, f.flight_number;