Lab normalization ddl and aggregation done

Solutions/airline_data.sql

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+INSERT INTO customers (id, name, status, total_mileage) VALUES
+                                                            (1, 'Agustine Riviera', 'Silver', 115235),
+                                                            (2, 'Alaina Sepulvida', NULL, 6008),
+                                                            (3, 'Tom Jones', 'Gold', 205767);
+
+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);
+
+INSERT INTO bookings (id, customer_id, flight_number) VALUES
+                                                          (1, 1, 'DL143'),
+                                                          (2, 1, 'DL122'),
+                                                          (3, 2, 'DL122'),
+                                                          (4, 3, 'DL53');

Solutions/airline_queries.sql

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+-- 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;

Solutions/airline_schema.sql

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+CREATE TABLE customers (
+                           id INT PRIMARY KEY,
+                           name VARCHAR(100),
+                           status VARCHAR(20),
+                           total_mileage INT
+);
+
+CREATE TABLE aircrafts (
+                           id INT PRIMARY KEY,
+                           name VARCHAR(100),
+                           total_seats INT
+);
+
+CREATE TABLE flights (
+                         flight_number VARCHAR(10) PRIMARY KEY,
+                         aircraft_id INT,
+                         mileage INT,
+                         FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE bookings (
+                          id INT PRIMARY KEY,
+                          customer_id INT,
+                          flight_number VARCHAR(10),
+                          FOREIGN KEY (customer_id) REFERENCES customers(id),
+                          FOREIGN KEY (flight_number) REFERENCES flights(flight_number)
+);

Solutions/blog_data.sql

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+-- Tabla authors
+INSERT INTO authors (id, name) VALUES
+                                   (1, 'Maria Charlotte'),
+                                   (2, 'Juan Perez'),
+                                   (3, 'Gemma Alcocer');
+
+-- Tabla blog_posts
+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);

Solutions/blog_schema.sql

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+CREATE TABLE authors (
+                         id INT PRIMARY KEY,
+                         name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE blog_posts (
+                            id INT PRIMARY KEY,
+                            author_id INT,
+                            title VARCHAR(255),
+                            word_count INT,
+                            views INT,
+                            FOREIGN KEY (author_id) REFERENCES authors(id)
+);