lab 3.02

solution.sql

@@ -0,0 +1,123 @@
+
+CREATE TABLE author (
+id INT AUTO_INCREMENT ,
+name VARCHAR(100) NOT NULL,
+PRIMARY KEY (id)
+);
+CREATE TABLE posts (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  author_id INT,
+  title VARCHAR(255) NOT NULL,
+  word_count INT,
+  views INT,
+  FOREIGN KEY (author_id) REFERENCES authors(id)
+);
+
+ -- TASK 2
+
+CREATE TABLE customers (
+id INT AUTO_INCREMENT PRIMARY KEY,
+customer_name VARCHAR(100) NOT NULL,
+customer_milage INT,
+status VARCHAR (30) DEFAULT 'none'
+);
+CREATE TABLE aircrafts (
+id INT AUTO_INCREMENT PRIMARY KEY,
+aircraft_name VARCHAR(100),
+aircraft_seats INT
+);
+CREATE TABLE flights (
+  flight_number VARCHAR(10) PRIMARY KEY,
+  aircraft_id INT,
+  milage INT,
+  FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
+);
+
+CREATE TABLE bookings (
+id INT AUTO_INCREMENT PRIMARY KEY,
+customer_id INT,
+flight_number VARCHAR(10),
+FOREIGN KEY (customer_id) REFERENCES customers(id),
+FOREIGN KEY (flight_number) REFERENCES flights(flight_number)
+);
+
+ /*INSERTIONS */
+INSERT INTO aircrafts (aircraft_name, aircraft_seats) VALUES
+('Boeing 747', 400),
+('Airbus A330', 236),
+('Boeing 777', 264);
+
+INSERT INTO flights (flight_number, aircraft_id,milage) VALUES
+('DL143', 1, 135),
+('DL122', 2, 4370),
+('DL53', 3, 2078),
+('DL222', 3, 1765),
+('DL37', 1, 531);
+
+INSERT INTO customers (customer_name,customer_milage,status) VALUES
+('Agustine Riviera', 115235, 'Silver'),
+('Alaina Sepulvida', 6008, 'None'),
+('Tom Jones', 205767, 'Gold'),
+('Sam Rio', 2653, 'None'),
+('Jessica James', 127656, 'Silver'),
+('Ana Janco', 136773, 'Silver'),
+('Jennifer Cortez', 300582, 'Gold'),
+('Christian Janco', 14642, 'Silver');
+
+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');
+
+
+SELECT c.id,c.customer_name,c.customer_milage,a.aircraft_name,a.aircraft_seats
+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 ;
+
+
+SELECT COUNT(DISTINCT flight_number) FROM flights;
+
+SELECT AVG(milage) FROM flights;
+
+SELECT AVG(aircraft_seats) FROM aircrafts;
+
+SELECT status, AVG(customer_milage) FROM customers GROUP BY status;
+
+SELECT status, MAX(customer_milage) FROM customers GROUP BY status;
+
+SELECT COUNT(*) FROM aircrafts WHERE aircraft_name LIKE '%Boeing%';
+
+SELECT * FROM flights WHERE milage BETWEEN 300 AND 2000;
+
+SELECT c.status, AVG(f.milage)
+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.aircraft_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.aircraft_name
+ORDER BY total_bookings DESC
+LIMIT 1;
+