lab done

lab2.sql

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+use lab_2;
+
+
+
+-- Exercise 1: Normalize a Blog Database
+-- in this exercise relation beween title and author is one to one.
+
+create table titles(
+
+	title_id int auto_increment primary key, 
+    title_name varchar(200), 
+    word_count int, 
+    views int
+);
+
+create table authors (
+
+	author_id int auto_increment primary key, 
+    author_fname varchar(100), 
+
+    title_id int, 
+
+    FOREIGN KEY (title_id) REFERENCES titles(title_id)
+
+
+);
+
+insert into titles(title_name, word_count, views) values
+('Best Paint Colors', 814, 14),
+('Small Space Decorating Tips', 1146, 221),
+('Hot Accessories', 986, 105),
+('Mixing Textures', 765, 22),
+('Kitchen Refresh', 1242, 307),
+('Homemade Art Hacks', 1002, 193),
+('Refinishing Wood Floors', 1571, 7542);
+
+
+insert into authors (author_fname, title_id) values
+('Maria Charlotte', 1),
+('Juan Perez', 2),
+('Maria Charlotte', 3),
+('Maria Charlotte', 4),
+('Juan Perez', 5),
+('Maria Charlotte', 6),
+('Gemma Alcocer', 7);
+
+
+
+
+-- Exercise 2: Normalize an Airline Database
+
+
+CREATE TABLE customers (
+   customer_id int NOT NULL AUTO_INCREMENT,
+   customer_name varchar(200) DEFAULT NULL,
+   customer_status varchar(200) DEFAULT 'None',
+   total_customer_mileage int DEFAULT NULL,
+   PRIMARY KEY (customer_id)
+ );
+
+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);
+
+CREATE TABLE aircrafts (
+   aircraft_name varchar(45) NOT NULL,
+   total_aircraft_seats int DEFAULT NULL,
+   PRIMARY KEY (aircraft_name),
+   UNIQUE KEY aircraft_name_UNIQUE (aircraft_name)
+ );
+
+
+INSERT INTO aircrafts (aircraft_name, total_aircraft_seats)
+VALUES
+('Boeing 747', 400),
+('Airbus A330', 236),
+('Boeing 777', 264);
+
+
+CREATE TABLE flights (
+   flight_number varchar(300) NOT NULL,
+   aircraft varchar(45) NOT NULL,
+   flight_mileage int DEFAULT NULL,
+   PRIMARY KEY (flight_number),
+   KEY aircraft_idx (aircraft),
+   CONSTRAINT aircraft FOREIGN KEY (aircraft) REFERENCES aircrafts (aircraft_name)
+ );
+
+INSERT INTO flights (flight_number, aircraft, flight_mileage)
+VALUES
+('DL143', 'Boeing 747', 135),
+('DL122', 'Airbus A330', 4370),
+('DL53', 'Boeing 777', 2078),
+('DL222', 'Boeing 777', 1765),
+('DL37', 'Boeing 747', 531);
+
+CREATE TABLE bookings (
+   customer_id int DEFAULT NULL,
+   flight_number varchar(300) DEFAULT NULL,
+   KEY customer_id_idx (customer_id),
+   KEY flight_number_idx (flight_number),
+   CONSTRAINT customer_id FOREIGN KEY (customer_id) REFERENCES customers (customer_id),
+   CONSTRAINT flight_number FOREIGN KEY (flight_number) REFERENCES flights (flight_number)
+ );
+
+INSERT INTO bookings (customer_id, flight_number)
+VALUES
+(1, 'DL143'),
+(1, 'DL122'),
+(2, 'DL122'),
+(3, 'DL122'),
+(3, 'DL53'),
+(3, 'DL222');
+
+
+-- Exercise 3: Write SQL Queries on the Airline Database
+
+SELECT COUNT(DISTINCT flight_number) FROM flights; -- 5
+
+SELECT AVG(flight_mileage) FROM flights; -- 1775.8000
+
+SELECT AVG(total_aircraft_seats) FROM aircrafts; -- 300.0000
+
+SELECT customer_status, AVG(total_customer_mileage) FROM customers GROUP BY customer_status; 
+-- Silver	98576.5000
+-- None	4330.5000
+-- Gold	253174.5000
+
+SELECT customer_status, MAX(total_customer_mileage) FROM customers GROUP BY customer_status;
+-- Silver	136773
+-- None	6008
+-- Gold	300582
+
+SELECT COUNT(*) FROM aircrafts WHERE aircraft_name LIKE '%Boeing%'; -- 2
+
+SELECT * FROM flights WHERE flight_mileage BETWEEN 300 AND 2000;
+-- DL222	Boeing 777	1765
+-- DL37	Boeing 747	531
+
+
+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_number = f.flight_number
+GROUP BY c.customer_status;
+-- DL222	Boeing 777	1765
+-- DL37	Boeing 747	531
+
+
+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_number = f.flight_number
+JOIN aircrafts a ON f.aircraft = a.aircraft_name
+WHERE c.customer_status = 'Gold'
+GROUP BY a.aircraft_name
+ORDER BY total_bookings DESC
+LIMIT 1;
+-- Boeing 777	2
+
+
+
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