Skip to content

All done[Sorry, I have already done, but forgot to submit] #44

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
kenanqafarov wants to merge 3 commits into
base: main
Choose a base branch
from
Open

All done[Sorry, I have already done, but forgot to submit] #44

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
886924e
All done[Sorry, I have already done, but forgot to submit]
kenanqafarov Mar 31, 2026
c5c8d1b
All done[Sorry, I have already done, but forgot to submit]
kenanqafarov Mar 31, 2026
4771b66
All done[Sorry, I have already done, but forgot to submit]
kenanqafarov Mar 31, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions .idea/.gitignore
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

9 changes: 9 additions & 0 deletions .idea/lab-java-normalization-ddl-aggregation.iml
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

6 changes: 6 additions & 0 deletions .idea/misc.xml
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

8 changes: 8 additions & 0 deletions .idea/modules.xml
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

6 changes: 6 additions & 0 deletions .idea/vcs.xml
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

47 changes: 47 additions & 0 deletions your-code/task1.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,47 @@
-- I create the database here --
CREATE DATABASE IF NOT EXISTS blogdb;

-- Then I use this database --
USE blogdb;

-- I drop tables first to avoid conflicts on re-run --
DROP TABLE IF EXISTS posts;
DROP TABLE IF EXISTS authors;

-- I create the authors table here --
CREATE TABLE authors (
id INT PRIMARY KEY,
name VARCHAR(100) NOT NULL UNIQUE
);

-- I create the posts table here --
CREATE TABLE posts (
id INT PRIMARY KEY,
author_id INT NOT NULL,
title VARCHAR(255) NOT NULL UNIQUE,
word_count INT NOT NULL CHECK (word_count > 0),
views INT NOT NULL DEFAULT 0 CHECK (views >= 0),
CONSTRAINT fk_author FOREIGN KEY (author_id) REFERENCES authors(id)
);

-- Then I add some data to the authors table --
INSERT INTO authors (id, name) VALUES
(1, 'Maria Charlotte'),
(2, 'Juan Perez'),
(3, 'Gemma Alcocer');

-- Then I add some data to the posts table --
INSERT INTO posts (id, author_id, title, word_count, views) VALUES
(1, 1, 'Best Paint Colors', 814, 14),
(2, 2, 'Small Space Decorating Tips',1146, 221),
(3, 1, 'Hot Accessories', 986, 105),
(4, 1, 'Mixing Textures', 765, 22),
(5, 2, 'Kitchen Refresh', 1242, 307),
(6, 1, 'Homemade Art Hacks', 1002, 193),
(7, 3, 'Refinishing Wood Floors', 1571, 7542);

-- I get all data from the posts table --
SELECT * FROM posts;

-- I get all data from the authors table --
SELECT * FROM authors;
92 changes: 92 additions & 0 deletions your-code/task2.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,92 @@
-- I create the database here --
CREATE DATABASE IF NOT EXISTS airlinedb;

-- Then I use this database --
USE airlinedb;

-- I drop all tables first to avoid conflicts on re-run --
DROP TABLE IF EXISTS bookings;
DROP TABLE IF EXISTS flights;
DROP TABLE IF EXISTS aircrafts;
DROP TABLE IF EXISTS customers;

-- I create the aircrafts table here --
CREATE TABLE aircrafts (
id INT PRIMARY KEY,
name VARCHAR(100) NOT NULL UNIQUE,
total_seats INT NOT NULL CHECK (total_seats > 0)
);

-- I create the flights table here --
CREATE TABLE flights (
flight_number VARCHAR(10) PRIMARY KEY,
aircraft_id INT NOT NULL,
mileage INT NOT NULL CHECK (mileage > 0),
CONSTRAINT fk_aircraft FOREIGN KEY (aircraft_id) REFERENCES aircrafts(id)
);

-- I create the customers table here --
CREATE TABLE customers (
id INT PRIMARY KEY,
name VARCHAR(150) NOT NULL UNIQUE,
status VARCHAR(20) NOT NULL DEFAULT 'None'
CHECK (status IN ('None', 'Silver', 'Gold')),
total_mileage INT NOT NULL DEFAULT 0 CHECK (total_mileage >= 0)
);

-- I create the bookings table here --
CREATE TABLE bookings (
id INT PRIMARY KEY,
customer_id INT NOT NULL,
flight_number VARCHAR(10) NOT NULL,
CONSTRAINT fk_customer FOREIGN KEY (customer_id) REFERENCES customers(id),
CONSTRAINT fk_flight FOREIGN KEY (flight_number) REFERENCES flights(flight_number),
UNIQUE (customer_id, flight_number)
);

-- Then I add some data to the aircrafts table --
INSERT INTO aircrafts (id, name, total_seats) VALUES
(1, 'Boeing 747', 400),
(2, 'Airbus A330', 236),
(3, 'Boeing 777', 264);

-- Then I add some data to the flights table --
INSERT INTO flights (flight_number, aircraft_id, mileage) VALUES
('DL143', 1, 1351),
('DL122', 2, 4370),
('DL53', 3, 2078),
('DL222', 3, 1765),
('DL37', 1, 531);

-- Then I add some data to the customers table --
INSERT INTO customers (id, name, status, total_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);

-- Then I add some data to the bookings table --
INSERT INTO bookings (id, customer_id, flight_number) VALUES
(1, 1, 'DL143'),
(2, 1, 'DL122'),
(3, 2, 'DL122'),
(4, 3, 'DL122'),
(5, 3, 'DL53'),
(6, 3, 'DL222'),
(7, 4, 'DL143'),
(8, 4, 'DL37'),
(9, 5, 'DL143'),
(10, 5, 'DL122'),
(11, 6, 'DL222'),
(12, 7, 'DL222'),
(13, 8, 'DL222');

-- I get all data from each table to verify the inserts --
SELECT * FROM aircrafts;
SELECT * FROM flights;
SELECT * FROM customers;
SELECT * FROM bookings;
60 changes: 60 additions & 0 deletions your-code/task3.sql
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
-- I use the airline database here --
USE airlinedb;

-- I get the total number of distinct flights here --
SELECT COUNT(DISTINCT flight_number) AS total_flights
FROM flights;

-- I get the average flight distance here --
SELECT AVG(mileage) AS avg_flight_distance
FROM flights;

-- I get the average number of seats per aircraft here --
SELECT AVG(total_seats) AS avg_seats_per_aircraft
FROM aircrafts;

-- I get the average mileage of customers grouped by status here --
SELECT
status,
AVG(total_mileage) AS avg_mileage
FROM customers
GROUP BY status;

-- I get the max mileage of customers grouped by status here --
SELECT
status,
MAX(total_mileage) AS max_mileage
FROM customers
GROUP BY status;

-- I count the aircraft that have Boeing in their name here --
SELECT COUNT(*) AS boeing_aircraft_count
FROM aircrafts
WHERE name LIKE '%Boeing%';

-- I get all flights with mileage between 300 and 2000 here --
SELECT *
FROM flights
WHERE mileage BETWEEN 300 AND 2000;

-- I get the average booked flight distance grouped by customer status here --
SELECT
c.status,
AVG(f.mileage) AS avg_booked_distance
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;

-- I get the most booked aircraft among Gold customers here --
SELECT
a.name AS aircraft,
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.name
ORDER BY total_bookings DESC
LIMIT 1;