Lab is done

Exercise1.sql

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+CREATE TABLE authors (
+    author_id INT PRIMARY KEY,
+    author_name VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE posts (
+    post_id INT PRIMARY KEY,
+    title VARCHAR(200) NOT NULL,
+    word_count INT,
+    views INT,
+    author_id INT,
+    FOREIGN KEY (author_id) REFERENCES authors(author_id)
+);
+
+INSERT INTO authors (author_id, author_name) VALUES
+(1, 'Maria Charlotte'),
+(2, 'Juan Perez'),
+(3, 'Gemma Alcocer');
+
+INSERT INTO posts (post_id, title, word_count, views, author_id) VALUES
+(1, 'Best Paint Colors', 814, 14, 1),
+(2, 'Small Space Decorating Tips', 1146, 221, 2),
+(3, 'Hot Accessories', 986, 105, 1),
+(4, 'Mixing Textures', 765, 22, 1),
+(5, 'Kitchen Refresh', 1242, 307, 2),
+(6, 'Homemade Art Hacks', 1002, 193, 1),
+(7, 'Refinishing Wood Floors', 1571, 7542, 3);

Exercise2.sql

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+CREATE TABLE customers (
+    customer_id INT PRIMARY KEY,
+    name VARCHAR(100),
+    status VARCHAR(20),
+    total_mileage INT
+);
+
+CREATE TABLE aircrafts (
+    aircraft_id INT PRIMARY KEY,
+    aircraft_name VARCHAR(100),
+    total_seats INT
+);
+
+CREATE TABLE flights (
+    flight_id INT PRIMARY KEY,
+    flight_number VARCHAR(10),
+    aircraft_id INT,
+    flight_mileage INT,
+    FOREIGN KEY (aircraft_id) REFERENCES aircrafts(aircraft_id)
+);
+
+CREATE TABLE bookings (
+    booking_id INT PRIMARY KEY,
+    customer_id INT,
+    flight_id INT,
+    FOREIGN KEY (customer_id) REFERENCES customers(customer_id),
+    FOREIGN KEY (flight_id) REFERENCES flights(flight_id)
+);
+
+
+INSERT INTO aircrafts VALUES
+(1, 'Boeing 747', 400),
+(2, 'Airbus A330', 236),
+(3, 'Boeing 777', 264),
+(4, 'Boeing 747', 531);
+
+
+INSERT INTO flights VALUES
+(1, 'DL143', 1, 135),
+(2, 'DL122', 2, 4370),
+(3, 'DL53', 3, 2078),
+(4, 'DL222', 3, 1765),
+(5, 'DL37', 4, 531);
+
+INSERT INTO customers VALUES
+(1, 'Agustine Riviera', 'Silver', 115235),
+(2, 'Alaina Sepulvida', 'None', 6008),
+(3, 'Tom Jones', 'Gold', 205767),
+(4, 'Sam Rio', 'None', 2653),
+(5, 'Jessica James', 'Silver', 127656),
+(6, 'Ana Janco', 'Silver', 136773),
+(7, 'Jennifer Cortez', 'Gold', 300582),
+(8, 'Christian Janco', 'Silver', 14642); 
+
+INSERT INTO bookings VALUES
+(1, 1, 1),
+(2, 1, 2),
+(3, 2, 2),
+(4, 3, 2),
+(5, 3, 3),
+(6, 1, 1),
+(7, 4, 1),
+(8, 1, 1),
+(9, 3, 4),
+(10, 5, 1),
+(11, 4, 1),
+(12, 6, 4),
+(13, 7, 4),
+(14, 5, 2),
+(15, 4, 5),
+(16, 8, 4);

Exercise3.sql

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+SELECT COUNT(DISTINCT flight_number) 
+FROM flights;
+SELECT AVG(flight_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 aircraft_name LIKE '%Boeing%';
+
+SELECT * 
+FROM flights 
+WHERE flight_mileage BETWEEN 300 AND 2000;
+
+SELECT c.status, AVG(f.flight_mileage)
+FROM bookings b
+JOIN customers c ON b.customer_id = c.customer_id
+JOIN flights f ON b.flight_id = f.flight_id
+GROUP BY c.status;
+
+SELECT a.aircraft_name, COUNT(*) AS total_bookings
+FROM bookings b
+JOIN customers c ON b.customer_id = c.customer_id
+JOIN flights f ON b.flight_id = f.flight_id
+JOIN aircrafts a ON f.aircraft_id = a.aircraft_id
+WHERE c.status = 'Gold'
+GROUP BY a.aircraft_name
+ORDER BY total_bookings DESC
+FETCH FIRST 1 ROW ONLY;
+
+
+CREATE TABLE customers (
+    customer_id INT PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    status VARCHAR(20) CHECK (status IN ('Gold','Silver','None')),
+    total_mileage INT DEFAULT 0 CHECK (total_mileage >= 0)
+);
+
+CREATE TABLE aircrafts (
+    aircraft_id INT PRIMARY KEY,
+    aircraft_name VARCHAR(100) NOT NULL,
+    total_seats INT NOT NULL CHECK (total_seats > 0)
+);
+
+CREATE TABLE flights (
+    flight_id INT PRIMARY KEY,
+    flight_number VARCHAR(10) UNIQUE NOT NULL,
+    aircraft_id INT NOT NULL,
+    flight_mileage INT CHECK (flight_mileage > 0),
+    FOREIGN KEY (aircraft_id) REFERENCES aircrafts(aircraft_id)
+);
+