Node week2/andrii p

databases/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

databases/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`) ON DELETE SET NULL
+);
+
+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 YEAR(created) AS year, MONTH(created) AS month, COUNT(*) AS task_count
+FROM task
+GROUP BY YEAR(created), MONTH(created)
+ORDER BY year, month;

databases/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') NOT NULL
+);
+
+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_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;

nodejs/week2/.gitignore

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+node_modules/

nodejs/week2/app.js

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+import express from "express";
+import fs from "fs";
+
+const docs = JSON.parse(fs.readFileSync("documents.json", "utf-8"));
+
+const app = express();
+const port = process.env.PORT || 3000;
+
+// Support parsing JSON requests
+app.use(express.json());
+
+app.get("/", (req, res) => {
+	res.send(docs);
+});
+
+app.get("/search", (req, res) => {
+	const { q } = req.query;
+
+	const filteredDocs = docs.filter((doc) =>
+		Object.values(doc).some(
+			(value) =>
+				typeof value === "string" &&
+				value.toLowerCase().includes(q.toLowerCase())
+		)
+	);
+
+	!q ? res.json(docs) : res.json(filteredDocs);
+});
+
+app.get("/documents/:id", (req, res) => {
+	const { id } = req.params;
+
+	const document = docs.find((doc) => doc.id === Number(id));
+
+	!document
+		? res.status(404).json({ message: "Document not found." })
+		: res.json(document);
+});
+
+app.post("/search", (req, res) => {
+	const { q } = req.params;
+	const { fields } = req.body;
+
+	if (q && fields) {
+		return res
+			.status(400)
+			.json({
+				error: "Cannot provide both query parameter and fields in body",
+			});
+	}
+
+    if (q && fields) {
+        return res.status(400).json({ error: "Both q and fields cannot be provided together" });
+    }
+
+    if (q) {
+        const filteredDocs = docs.filter((doc) =>
+            Object.values(doc).some(
+                (value) =>
+                    typeof value === "string" &&
+                    value.toLowerCase().includes(q.toLowerCase())
+            )
+        );
+        return res.json(filteredDocs);
+    }
+
+    if (fields) {
+        const filteredDocs = docs.filter((doc) =>
+            Object.entries(fields).every(([key, value]) => doc[key] === value)
+        );
+        return res.json(filteredDocs);
+    }
+
+    res.json(docs);
+});
+
+app.listen(port, () => {
+	console.log(`Listening on port ${port}`);
+});

nodejs/week2/documents.json

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+[
+    {
+        "id": 1,
+        "name": "Used Apple Airpods",
+        "price": "50",
+        "description": "Battery life is not great"
+    },
+    {
+        "id": 2,
+        "type": "doc",
+        "value": "hello world"
+    }
+]