From b8bf096ea0fafd7b93d6e9ccd4bf33e575827f02 Mon Sep 17 00:00:00 2001
From: Nuray Taghiyeva <tagiyevanuray35@gmail.com>
Date: Tue, 31 Mar 2026 09:03:05 +0400
Subject: [PATCH] complete normalization and airline database exercises

---
 solution_normalization.sql | 100 +++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 solution_normalization.sql

diff --git a/solution_normalization.sql b/solution_normalization.sql
new file mode 100644
index 0000000..3bfba88
--- /dev/null
+++ b/solution_normalization.sql
@@ -0,0 +1,100 @@
+
+-- EXERCISE 1: Blog Database (Normalization)
+
+CREATE DATABASE IF NOT EXISTS blog_db;
+USE blog_db;
+
+CREATE TABLE authors (
+                         author_id INT AUTO_INCREMENT PRIMARY KEY,
+                         author_name VARCHAR(255) NOT NULL
+);
+
+CREATE TABLE blog_posts (
+                            post_id INT AUTO_INCREMENT PRIMARY KEY,
+                            title VARCHAR(255) NOT NULL,
+                            word_count INT,
+                            views INT,
+                            author_id INT,
+                            FOREIGN KEY (author_id) REFERENCES authors(author_id)
+);
+
+INSERT INTO authors (author_name) VALUES ('Maria Charlotte'), ('Juan Perez'), ('Gemma Alcocer');
+
+INSERT INTO blog_posts (title, word_count, views, author_id) VALUES
+                                                                 ('Best Paint Colors', 814, 14, 1),
+                                                                 ('Small Space Decorating Tips', 1146, 221, 2),
+                                                                 ('Hot Accessories', 986, 105, 1),
+                                                                 ('Mixing Textures', 765, 22, 1),
+                                                                 ('Kitchen Refresh', 1242, 307, 2),
+                                                                 ('Homemade Art Hacks', 1002, 193, 1),
+                                                                 ('Refinishing Wood Floors', 1571, 7542, 3);
+
+
+-- EXERCISE 2: Airline Database (Normalization)
+
+CREATE DATABASE IF NOT EXISTS airline_db;
+USE airline_db;
+
+CREATE TABLE aircrafts (
+                           aircraft_model VARCHAR(50) PRIMARY KEY,
+                           total_seats INT
+);
+
+CREATE TABLE flights (
+                         flight_number VARCHAR(10) PRIMARY KEY,
+                         aircraft_model VARCHAR(50),
+                         flight_mileage INT,
+                         FOREIGN KEY (aircraft_model) REFERENCES aircrafts(aircraft_model)
+);
+
+CREATE TABLE customers (
+                           customer_id INT AUTO_INCREMENT PRIMARY KEY,
+                           customer_name VARCHAR(100),
+                           customer_status VARCHAR(20),
+                           total_customer_mileage INT
+);
+
+CREATE TABLE bookings (
+                          booking_id INT AUTO_INCREMENT PRIMARY KEY,
+                          customer_id INT,
+                          flight_number VARCHAR(10),
+                          FOREIGN KEY (customer_id) REFERENCES customers(customer_id),
+                          FOREIGN KEY (flight_number) REFERENCES flights(flight_number)
+);
+
+
+INSERT INTO aircrafts VALUES ('Boeing 747', 400), ('Airbus A330', 236), ('Boeing 777', 264);
+INSERT INTO flights VALUES ('DL143', 'Boeing 747', 135), ('DL122', 'Airbus A330', 4370), ('DL222', 'Boeing 777', 1765);
+INSERT INTO customers (customer_name, customer_status, total_customer_mileage)
+VALUES ('Agustine Riviera', 'Silver', 115235), ('Tom Jones', 'Gold', 205767), ('Sam Rio', 'None', 2653);
+INSERT INTO bookings (customer_id, flight_number) VALUES (1, 'DL143'), (2, 'DL222'), (3, 'DL143');
+
+
+-- EXERCISE 3: Airline Database Queries
+
+SELECT COUNT(*) FROM flights;
+
+
+SELECT AVG(flight_mileage) FROM flights;
+
+
+SELECT AVG(total_seats) FROM aircrafts;
+
+
+SELECT customer_status, AVG(total_customer_mileage) FROM customers GROUP BY customer_status;
+
+
+SELECT customer_status, MAX(total_customer_mileage) FROM customers GROUP BY customer_status;
+
+
+SELECT COUNT(*) FROM aircrafts WHERE aircraft_model LIKE '%Boeing%';
+
+
+SELECT * FROM flights WHERE flight_mileage BETWEEN 300 AND 2000;
+
+
+SELECT c.customer_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;
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