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+-- Exercise 1: Normalize a Blog Database
+
+create table if not exists authors(
+id int auto_increment primary key,
+name varchar(50) not null
+);
+create table if not exists posts(
+id int auto_increment primary key,
+title varchar(100) not null,
+word_count int not null,
+views int not null,
+author_id int not null,
+constraint fk_posts_author foreign key (author_id) references authors(id)
+);
+INSERT INTO authors (name) 
+VALUES ('Maria Charlotte'), ('Juan Perez'), ('Gemma Alcocer');
+
+INSERT INTO posts (author_id, title, word_count, views) VALUES
+  (1, 'Best Paint Colors', 814, 14),
+  (2, 'Small Space Decorating Tips', 1146, 221),
+  (1, 'Hot Accessories', 986, 105),
+  (1, 'Mixing Textures', 765, 22),
+  (2, 'Kitchen Refresh', 1242, 307),
+  (1, 'Homemade Art Hacks', 1002, 193),
+  (3, 'Refinishing Wood Floors', 1571, 7542);
+
+
+-- Exercise 2: Normalize an Airline Database
+create table if not exists customers (
+    id int auto_increment primary key,
+    customer_name varchar(50) not null,
+    status varchar(50) not null,
+    total_mileage int not null
+);
+
+create table if not exists aircrafts (
+    id int auto_increment primary key,
+    aircraft_name varchar(50) not null,
+    seats int not null
+);
+
+create table if not exists flights (
+    id int auto_increment primary key,
+    flight_number varchar(10) not null unique,
+    mileage int not null,
+    aircraft_id int not null,
+    constraint fk_flights_aircraft
+        foreign key (aircraft_id) references aircrafts(id)
+);
+
+create table if not exists bookings (
+    id int auto_increment primary key,
+    customer_id int not null,
+    flight_number varchar(10) not null,
+    constraint fk_bookings_customers
+        foreign key (customer_id) references customers(id),
+    constraint fk_bookings_flights
+        foreign key (flight_number) references flights(flight_number)
+);
+
+insert into customers (customer_name, status, total_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 aircrafts (aircraft_name, seats) values
+('Boeing 747', 400),
+('Airbus A330', 236),
+('Boeing 777', 264);
+
+insert into flights (flight_number, mileage, aircraft_id) values
+('DL143', 135, 1),
+('DL122', 4370, 2),
+('DL53', 2078, 3),
+('DL222', 1765, 3),
+('DL37', 531, 1);
+
+insert into bookings (customer_id, flight_number) values
+(1, 'DL143'),
+(1, 'DL122'),
+(2, 'DL122'),
+(3, 'DL122'),
+(3, 'DL53'),
+(3, 'DL222'),
+(4, 'DL143'),
+(4, 'DL37'),
+(5, 'DL143'),
+(5, 'DL122'),
+(6, 'DL222'),
+(7, 'DL222'),
+(8, 'DL222');
+
+
+-- Exercise 3: Write SQL Queries on the Airline Database
+-- 1.Total number of flights:
+select count(distinct flight_number) from flights;
+
+-- 2.Average flight distance:
+select avg(mileage) from flights;
+
+-- 3.Average number of seats per aircraft:
+select avg(seats) from aircrafts;
+
+-- 4.Average miles flown by customers, grouped by status:
+select status, avg(total_mileage) from customers group by status;
+
+-- 5.Max miles flown by customers, grouped by status:
+select status, max(total_mileage) from customers group by status;
+
+-- 6.Number of aircrafts with "Boeing" in their name:
+select count(*) from aircrafts where aircraft_name like '%Boeing%';
+
+-- 7.Flights with distance between 300 and 2000 miles:
+select * from flights where mileage between 300 and 2000;
+
+-- 8.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 status;
+
+-- 9.Most booked aircraft among Gold status members:
+select a.aircraft_name, count(*) as total_booking
+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_booking desc 
+limit 1;
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