Solution submission v_1

HelloNormalisation_/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

HelloNormalisation_/HelloNormalisation_.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

HelloNormalisation_/setup.sql

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+CREATE DATABASE blog_db;
+
+USE blog_db;
+
+-- DROP TABLE Authors;
+CREATE TABLE Authors
+(
+    author_id   INT PRIMARY KEY AUTO_INCREMENT,
+    author_name VARCHAR(100) NOT NULL
+);
+
+-- DROP TABLE Articles;
+CREATE TABLE Articles
+(
+    article_id INT PRIMARY KEY AUTO_INCREMENT,
+    title      VARCHAR(150) 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 Articles (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);
+
+
+-- DROP TABLE Customers;
+CREATE TABLE Customers (
+                           customer_id INT PRIMARY KEY AUTO_INCREMENT,
+                           customer_name VARCHAR(100) NOT NULL,
+                           customer_status VARCHAR(20) CHECK (customer_status in ('Silver', 'Gold', 'None')),
+                           total_customer_mileage INT NOT NULL CHECK (total_customer_mileage >= 0)
+);
+
+-- DROP TABLE Aircraft;
+CREATE TABLE Aircrafts (
+                           aircraft_id INT PRIMARY KEY AUTO_INCREMENT,
+                           aircraft_model VARCHAR(50) NOT NULL,
+                           total_seats INT NOT NULL CHECK ( total_seats > 0 )
+);
+
+-- DROP TABLE Flights;
+CREATE TABLE flights (
+                         flight_id INT PRIMARY KEY AUTO_INCREMENT,
+                         flight_number VARCHAR(10),
+                         aircraft_id INT,
+                         flight_mileage INT NOT NULL CHECK ( flight_mileage > 0 ),
+                         FOREIGN KEY (aircraft_id) REFERENCES aircrafts(aircraft_id)
+);
+
+-- DROP TABLE bookings;
+CREATE TABLE bookings (
+                          booking_id INT PRIMARY KEY AUTO_INCREMENT,
+                          customer_id INT NOT NULL,
+                          flight_id INT NOT NULL,
+                          FOREIGN KEY (customer_id) REFERENCES customers(customer_id),
+                          FOREIGN KEY (flight_id) REFERENCES flights(flight_id),
+                          UNIQUE (customer_id, flight_id)
+);
+
+-- Creating Indexes for imnproved join performance
+CREATE INDEX idx_flights_aircraft ON Flights(aircraft_id);
+CREATE INDEX idx_bookings_customer ON Bookings(customer_id);
+CREATE INDEX idx_bookings_flight ON Bookings(flight_id);
+
+
+
+INSERT INTO customers (customer_id, customer_name, customer_status, total_customer_mileage) 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 aircrafts (aircraft_id, aircraft_model, total_seats) VALUES
+                                                                     (1, 'Boeing 747', 400),
+                                                                     (2, 'Airbus A330', 236),
+                                                                     (3, 'Boeing 777', 264);
+
+
+INSERT INTO flights (flight_id, flight_number, aircraft_id, flight_mileage) VALUES
+                                                                                (1, 'DL143', 1, 135),
+                                                                                (2, 'DL122', 2, 4370),
+                                                                                (3, 'DL53', 3, 2078),
+                                                                                (4, 'DL222', 3, 1765),
+                                                                                (5, 'DL37', 1, 531);
+
+INSERT INTO bookings (booking_id, customer_id, flight_id) VALUES
+                                                              (1, 1, 1),
+                                                              (2, 1, 2),
+                                                              (3, 2, 2),
+                                                              (4, 3, 2),
+                                                              (5, 3, 3),
+                                                              (6, 3, 4),
+                                                              (7, 4, 1),
+                                                              (8, 4, 5),
+                                                              (9, 5, 1),
+                                                              (10, 5, 2),
+                                                              (11, 6, 4),
+                                                              (12, 7, 4),
+                                                              (13, 8, 4);
+
+
+SELECT COUNT(DISTINCT flight_number) FROM flights;
+-- Answer: 5
+
+SELECT AVG(flight_mileage) FROM flights;
+-- Answer: 1775.8000
+
+SELECT AVG(total_seats) FROM aircrafts;
+-- Answer: 300.0000
+
+SELECT customer_status, AVG(total_customer_mileage) AS avg_mileage
+FROM Customers
+GROUP BY customer_status;
+-- Answer: Silver - 98576.5000, None - 4330.5000, Gold - 253174.5000
+
+SELECT customer_status, MAX(total_customer_mileage) as max_mileage
+FROM Customers
+GROUP BY customer_status;
+-- Answer: Silver - 136773, None - 6008, Gold - 300582
+
+SELECT COUNT(*) FROM aircrafts WHERE aircraft_model LIKE '%Boeing%';
+-- Answer: 2
+
+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_id = f.flight_id
+GROUP BY c.customer_status;
+-- Answer: Silver - 2090.0000, None - 1678.6667, Gold - 2494.5000
+
+SELECT a.aircraft_model, 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.customer_status = 'Gold'
+GROUP BY a.aircraft_model
+ORDER BY total_bookings DESC
+LIMIT 1;
+-- Answer: Boeing 777 - 3
+
+

HelloNormalisation_/src/Main.java

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+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class Main {
+    public static void main(String[] args) {
+        //TIP Press <shortcut actionId="ShowIntentionActions"/> with your caret at the highlighted text
+        // to see how IntelliJ IDEA suggests fixing it.
+        System.out.printf("Hello and welcome!");
+
+        for (int i = 1; i <= 5; i++) {
+            //TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
+            // for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
+            System.out.println("i = " + i);
+        }
+    }
+}