Node week3/andrii p

databases/week3/hw3.sql

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+CREATE DATABASE hw3_meal
+
+USE hw3_meal;
+
+CREATE TABLE meal (
+    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    `title` VARCHAR(100) NOT NULL,
+    `description` TEXT,
+    `location` VARCHAR(255) NOT NULL,
+    `when` DATETIME NOT NULL,
+    `max_reservations` INT UNSIGNED NOT NULL,
+    `price` DECIMAL(10,2),
+    `created_date` DATE NOT NULL 
+);
+
+CREATE TABLE `reservation` (
+    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    `number_of_guests` INT UNSIGNED NOT NULL,
+    `meal_id` INT(10) UNSIGNED NOT NULL,
+    `created_date` DATE NOT NULL,
+    `contact_phonenumber` VARCHAR(100) NOT NULL,
+    `contact_name` VARCHAR(100) NOT NULL,
+    `contact_email` VARCHAR(100) NOT NULL,
+    FOREIGN KEY (`meal_id`) REFERENCES `meal`(`id`) ON DELETE CASCADE
+);
+
+CREATE TABLE `review` (
+    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    `title` VARCHAR(100) NOT NULL,
+    `description` TEXT,
+    `meal_id` INT(10) UNSIGNED NOT NULL,
+    `stars` INT(5) NOT NULL,
+    `created_date` DATE NOT NULL,
+    FOREIGN KEY (`meal_id`) REFERENCES `meal`(`id`) ON DELETE CASCADE
+)
+
+
+-- QUERIES
+
+-- Meal
+
+SELECT * 
+FROM meal;
+
+INSERT INTO meal (title, description, location, `when`, max_reservations, price, created_date)
+VALUES ('Traditonal Sicilian Pasta Carbonara', 'Master class from of cooking Carbonara from the best sicilain chef.', 'Palermo, IT', '2025-05-09', 25, 34.99, '2025-02-17');
+
+INSERT INTO meal (title, description, location, `when`, max_reservations, price, created_date)
+VALUES ('10 Different ways to make a great pizza', 'Very good mini-course of making real italian pizza', 'Rome, IT', '2025-04-23', 20, 24.00, '2025-02-19');
+
+SELECT *
+FROM meal
+WHERE id = 2;
+
+UPDATE meal 
+SET location = 'Napoli, IT',
+    price = 29.95
+WHERE id = 2;
+
+DELETE FROM meal
+WHERE id = 1
+
+-- Reservation
+
+SELECT *
+FROM reservation
+
+INSERT INTO `reservation` (`number_of_guests`, `meal_id`, `created_date`, `contact_phonenumber`, `contact_name`, `contact_email`) 
+VALUES (4, 2, CURDATE(), '52 45 12 34', 'Pedro Moretti', '[email protected]');
+
+SELECT * FROM `reservation` WHERE `id` = 2;
+
+UPDATE `reservation` 
+SET `number_of_guests` = 10 
+WHERE `id` = 2;
+
+UPDATE `reservation` 
+SET `number_of_guests` = 7, 
+    `contact_name` = 'Anna-Maria Moretti', 
+    `contact_email` = '[email protected]' 
+WHERE `id` = 2;
+
+DELETE FROM reservation
+WHERE id = 2
+
+-- Review
+
+SELECT * FROM `review`;
+
+INSERT INTO `review` (`title`, `description`, `meal_id`, `stars`, `created_date`) 
+VALUES ('Great meal!', 'It was very, very tasty and the service was TOP!', 2, 5, CURDATE());
+
+SELECT * FROM review
+WHERE id = 1
+
+UPDATE `review` 
+SET `description` = 'Et kæmpe stort TAK til alle, der lavede den lækker mad!',
+    `title` = 'Super!!'
+WHERE `id` = 1;
+
+DELETE FROM review
+WHERE id = 2
+
+-- Additional queries
+
+SELECT * FROM meal
+WHERE price >= 90;
+
+SELECT m.*
+FROM meal m
+LEFT JOIN (
+    SELECT meal_id, SUM(number_of_guests) AS total_reserved
+    FROM reservation
+    GROUP BY meal_id
+) r ON m.id = r.meal_id
+WHERE r.total_reserved IS NULL OR r.total_reserved < m.max_reservations;
+
+
+SELECT * FROM `meal` 
+WHERE `title` LIKE '%Rød grød med%';
+
+
+SELECT * FROM `meal` 
+WHERE `created_date` BETWEEN '2025-01-01' AND '2026-02-01';
+
+
+SELECT * FROM `meal` 
+LIMIT 5;
+
+
+SELECT DISTINCT *
+FROM meal m
+JOIN review r ON m.id = r.meal_id
+WHERE r.stars >= 4;
+
+SELECT * FROM `reservation` 
+WHERE `meal_id` = 2 
+ORDER BY `created_date` DESC;
+
+SELECT m.*, AVG(r.stars) AS avg_stars
+FROM `meal` m
+LEFT JOIN `review` r ON m.id = r.meal_id
+GROUP BY m.id
+ORDER BY avg_stars DESC;

javascript/javascript1/week1/homework_1.sql

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+--1. Find out how many tasks are in the task table
+
+SELECT COUNT (*)
+FROM task
+
+--2. Find out how many tasks in the task table do not have a valid due date
+
+SELECT COUNT (*)
+FROM task 
+WHERE due_date IS NULL
+
+--3. Find all the tasks that are marked as done
+
+SELECT task.title, status.name
+FROM task JOIN status ON task.status_id = status.id
+WHERE status.name IN ('Done')
+
+--4. Find all the tasks that are not marked as done
+
+SELECT task.title, status.name
+FROM task JOIN status ON task.status_id = status.id
+WHERE status.name NOT IN ('Done')
+
+--5. Get all the tasks, sorted with the most recently created first
+
+SELECT * 
+FROM task
+ORDER BY created
+
+--6. Get the single most recently created task
+
+SELECT * 
+FROM task
+ORDER BY created
+LIMIT 1 
+
+--7. Get the title and due date of all tasks where the title or description contains database
+
+SELECT task.title, task.due_date
+FROM task 
+WHERE task.title LIKE '%database%' 
+   OR task.description LIKE '%database%';
+
+--8. Get the title and status (as text) of all tasks
+
+SELECT task.title, status.name
+FROM task JOIN status ON task.status_id = status.id
+
+--9. Get the name of each status, along with a count of how many tasks have that status
+
+SELECT status.name, COUNT(task.id)
+FROM status
+LEFT JOIN task ON status.id = task.status_id
+GROUP BY status.name;
+
+--10. Get the names of all statuses, sorted by the status with most tasks first
+
+SELECT status.name, COUNT(task.id) AS task_count
+FROM status
+LEFT JOIN task ON status.id = task.status_id
+GROUP BY status.name
+ORDER BY task_count DESC

javascript/javascript1/week2/HW2.sql

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+-- Part 1: Working with tasks
+
+USE hw
+
+INSERT INTO task (title, description, created, updated, due_date, status_id, user_id)
+VALUES ('Do your homework', 'You need to complete your homework, consists of 4 parts', '2025-02-09', '2025-02-11', '2025-02-16', 2, 5 );
+
+UPDATE task
+SET title = 'Do your hw and class preparation',
+    due_date = '2025-02-14 22:30:00',
+    status_id = 3
+WHERE id = 36
+
+DELETE FROM task 
+WHERE id = 36
+
+SELECT * FROM task
+
+-- Part 2: School database
+
+USE DB_HW2
+
+CREATE TABLE `class` (
+    `id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    `name` VARCHAR(255) NOT NULL,
+    `begins` DATETIME NOT NULL,
+    `ends` DATETIME NULL
+);
+
+CREATE TABLE `student` (
+    `id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    `name` VARCHAR (255) NOT NULL,
+    `email` VARCHAR(255) NULL,
+    `phone` VARCHAR(255) NULL,
+    `class_id` int(10) UNSIGNED NOT NULL,
+    CONSTRAINT `fk_class` FOREIGN KEY (`class_id`) REFERENCES `class` (`id`)
+);
+
+CREATE INDEX idx_student_name
+ON student (name);
+
+ALTER TABLE class
+ADD status ENUM('not-started', 'ongoing', 'finished') NOT NULL
+
+-- Part 3: More queries
+
+USE hw
+
+SELECT * 
+FROM task
+JOIN user_task ON task.id = user_task.task_id
+JOIN user ON user_task.user_id = user.id
+WHERE user.email LIKE '%@spotify.com';
+
+SELECT *
+FROM task
+JOIN user_task ON task.id = user_task.task_id
+JOIN user ON user_task.user_id = user.id
+JOIN status ON task.status_id = status_id
+WHERE user.name = 'Donald Duck'
+AND status.name = 'Not started';
+
+SELECT *
+FROM task
+JOIN user_task ON task.id = user_task.task_id
+JOIN user ON user_task.user_id = user.id
+JOIN status ON task.status_id = status_id
+WHERE user.name = 'Maryrose Meadows'
+AND MONTH(created) = 9
+
+SELECT MONTH(created) AS month_number, COUNT(*) AS task_count
+FROM task
+GROUP BY MONTH(created)
+ORDER BY month_number;
+
+
+-- Part 4: Creating a database
+

javascript/javascript1/week2/task4CreatingDB.sql

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+CREATE DATABASE `factory_db`
+    DEFAULT CHARACTER SET = 'utf8mb4';
+
+USE factory_db;
+
+CREATE TABLE `departments` (
+    `id` INT UNSIGNED NOT NULL  PRIMARY KEY AUTO_INCREMENT,
+    `name` VARCHAR (50) NOT NULL
+);
+
+INSERT INTO departments (name) 
+VALUES ('Compact'), ('Maxi'), ('Lager');
+
+CREATE TABLE `duties` (
+    `id` INT UNSIGNED NOT NULL  PRIMARY KEY AUTO_INCREMENT,
+    `duty_name` VARCHAR(50) NOT NULL UNIQUE,
+    `description` TEXT
+);
+
+INSERT INTO duties (duty_name, description) VALUES
+('Quality Control', 'Inspect products for defects'),
+('Employee Hiring', 'Find more employees'),
+('Inventory Management', 'Monitor stock levels');
+
+CREATE TABLE `shifts` (
+    `id` INT UNSIGNED NOT NULL  PRIMARY KEY AUTO_INCREMENT,
+    `shift_name` ENUM('morning', 'afternoon', 'night')
+);
+
+INSERT INTO shifts (shift_name) 
+VALUES ('morning'), ('afternoon'), ('night');
+
+CREATE TABLE `staff` (
+    `id` INT UNSIGNED NOT NULL  PRIMARY KEY AUTO_INCREMENT,
+    `name` VARCHAR(50) NOT NULL,
+    `depart_id` INT UNSIGNED NOT NULL,
+    `shift_id` INT UNSIGNED NOT NULL,
+    FOREIGN KEY(`depart_id`) REFERENCES `departments` (`id`) ON DELETE CASCADE,
+    FOREIGN KEY(`shift_id`) REFERENCES `shifts` (`id`) ON DELETE CASCADE
+);
+
+INSERT INTO staff (name, depart_id, shift_id) VALUES
+('Jens Jakobsen', 1, 2),
+('Andrii Pavliuk', 2, 3),
+('Lene Vestergaard', 3, 1);
+
+CREATE TABLE staff_duties (
+    staff_id INT UNSIGNED,
+    duty_id INT UNSIGNED,
+    created DATETIME NOT NULL,
+    PRIMARY KEY (staff_id, duty_id),
+    FOREIGN KEY (staff_id) REFERENCES staff(id) ON DELETE CASCADE,
+    FOREIGN KEY (duty_id) REFERENCES duties(id) ON DELETE CASCADE
+);
+
+INSERT INTO staff_duties (staff_id, duty_id, created) VALUES
+(1, 1, '2025-02-13'),
+(2, 2, '2025-02-14'),
+(3, 3, '2025-02-15');
+
+SELECT staff.name AS Employee, staff_duties.created, duties.duty_name, duties.description 
+FROM staff
+JOIN staff_duties ON staff.id = staff_duties.staff_id
+JOIN duties ON staff_duties.duty_id = duties.id;
+
+SELECT 
+    staff.name AS Employee, 
+    departments.name AS Department, 
+    shifts.shift_name AS Shift 
+FROM staff
+JOIN departments ON staff.depart_id = departments.id
+JOIN shifts ON staff.shift_id = shifts.id;