Nodejs week3/parisa

databases/week1/database.sql

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+USE hyf_lesson1
+
+SELECT COUNT(*) AS total_tasks FROM task;
+
+SELECT COUNT(*) AS invalid_due_dates 
+FROM task 
+WHERE due_date IS NULL 
+
+SELECT * 
+FROM task 
+WHERE status_id = (SELECT id FROM status WHERE name = 'Done');
+
+SELECT * 
+FROM task 
+WHERE status_id != (SELECT id FROM status WHERE name = 'Done');
+
+SELECT * 
+FROM task 
+ORDER BY created DESC;
+
+SELECT * 
+FROM task 
+ORDER BY created DESC 
+LIMIT 1;
+
+SELECT title, due_date
+FROM task
+WHERE title LIKE '%database%' 
+OR description LIKE '%database%';
+
+SELECT task.title, status.name AS status
+FROM task
+JOIN status ON task.status_id = status.id;
+
+SELECT status.name, COUNT(task.id) AS task_count
+FROM status
+LEFT JOIN task ON status.id = task.status_id
+GROUP BY status.name;
+
+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/database_animal.sql

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+CREATE TABLE Farmers (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL
+);
+
+CREATE TABLE Barns (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    location VARCHAR(255) NOT NULL,
+    capacity INT NOT NULL
+);
+
+CREATE TABLE Animals (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(255) NOT NULL,
+    species VARCHAR(100) NOT NULL,
+    age INT NOT NULL,
+    barn_id INT,
+    FOREIGN KEY (barn_id) REFERENCES Barns(id) ON DELETE SET NULL
+);
+
+CREATE TABLE Farmer_Animal (
+    farmer_id INT,
+    animal_id INT,
+    PRIMARY KEY (farmer_id, animal_id),
+    FOREIGN KEY (farmer_id) REFERENCES Farmers(id) ON DELETE CASCADE,
+    FOREIGN KEY (animal_id) REFERENCES Animals(id) ON DELETE CASCADE
+);

databases/week2/database_school.sql

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+CREATE DATABASE School_database;
+USE School_database;
+
+CREATE TABLE classes (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    begins DATE NOT NULL,
+    ends DATE NOT NULL,
+    status ENUM('not-started', 'ongoing', 'finished') NOT NULL DEFAULT 'not-started'
+);
+
+CREATE TABLE Students (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    phone VARCHAR(20) NOT NULL,
+    classes_id INT,
+    FOREIGN KEY (classes_id) REFERENCES classes(id) ON DELETE SET NULL
+);
+
+CREATE INDEX idx_student_name ON Students(name);
+
+SELECT* FROM Students;

databases/week2/database_tasks.sql

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+USE hyf_lesson2;
+
+insert into task (title, description, created, updated, due_date, status_id) values ('Wash dishes', 'This is in priority.', '2025-02-11 06:54:16', '2025-02-11 06:54:16', '2025-02-12', 1);
+
+UPDATE task
+SET title = 'Go Playground'
+WHERE id = 5;
+
+UPDATE task
+SET due_date = '2025-02-25'
+WHERE id = 6;
+
+UPDATE task
+SET status_id = 2
+WHERE id = 7;
+
+UPDATE status
+SET name = 'Completed'
+WHERE id = 8;
+
+DELETE FROM task
+WHERE id = 9;
+
+SELECT* FROM task;
+
+SELECT * 
+FROM task 
+WHERE email LIKE '%@spotify.com';
+
+SELECT * 
+FROM task 
+WHERE assigned_to = 'Donald Duck' 
+AND status = 'Not started';
+
+SELECT * 
+FROM task
+WHERE assigned_to = 'Maryrose Meadows' 
+AND MONTH(created) = 9;
+
+SELECT MONTH(created) AS month, COUNT(*) AS task_count
+FROM tasks
+GROUP BY MONTH(created)
+ORDER BY month;

databases/week3/database.meal.sql

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+CREATE DATABASE MealReservationDB;
+USE MealReservationDB;
+
+CREATE TABLE Meal (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    description TEXT,
+    location VARCHAR(255),
+    `when` DATETIME NOT NULL,
+    max_reservations INT,
+    price DECIMAL(10,2),
+    created_date DATE NOT NULL
+);
+
+CREATE TABLE Reservation (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    number_of_guests INT NOT NULL,
+    meal_id INT,
+    created_date DATE NOT NULL,
+    contact_phonenumber VARCHAR(20),
+    contact_name VARCHAR(255),
+    contact_email VARCHAR(255),
+    FOREIGN KEY (meal_id) REFERENCES Meal(id) ON DELETE CASCADE
+);
+
+CREATE TABLE Review (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(255) NOT NULL,
+    description TEXT,
+    meal_id INT,
+    stars INT CHECK (stars BETWEEN 1 AND 5),
+    created_date DATE NOT NULL,
+    FOREIGN KEY (meal_id) REFERENCES Meal(id) ON DELETE CASCADE
+);
+
+SELECT * FROM Meal;
+
+INSERT INTO Meal (title, description, location, `when`, max_reservations, price, created_date)
+VALUES 
+('Pasta Carbonara', 'Italian pasta with creamy sauce', 'Rome, Italy', '2025-03-01 18:30:00', 20, 85.50, '2025-02-18');
+INSERT INTO Meal (title, description, location, `when`, max_reservations, price, created_date)
+VALUES ('Kebab Koobideh', 'Grilled minced lamb kebabs served with saffron rice', 'Tehran, Iran', '2025-03-05 19:00:00', 20, 75.00, '2025-02-18'),
+
+('Ghormeh Sabzi', 'Persian herb stew with lamb and kidney beans', 'Shiraz, Iran', '2025-03-10 20:00:00', 15, 85.00, '2025-02-18'),
+
+('Fesenjan', 'Rich pomegranate and walnut stew with chicken', 'Isfahan, Iran', '2025-03-15 19:30:00', 12, 95.00, '2025-02-18'),
+
+('Zereshk Polo ba Morgh', 'Saffron rice with barberries and slow-cooked chicken', 'Mashhad, Iran', '2025-03-20 18:00:00', 25, 70.00, '2025-02-18'),
+
+('Baghali Polo', 'Dill and fava bean rice served with tender lamb shank', 'Tabriz, Iran', '2025-03-25 19:00:00', 18, 100.00, '2025-02-18');
+
+SELECT * FROM Meal WHERE id = 1;
+
+UPDATE Meal 
+SET title = 'Spaghetti Bolognese', price = 95.00
+WHERE id = 1;
+
+DELETE FROM Meal WHERE id = 1;
+
+ALTER TABLE Meal AUTO_INCREMENT = 1;
+INSERT INTO Meal (id, title, description, location, `when`, max_reservations, price, created_date)
+VALUES 
+(1, 'Pasta Carbonara', 'Italian pasta with creamy sauce', 'Rome, Italy', '2025-03-01 18:30:00', 20, 85.50, '2025-02-18');
+
+SELECT * FROM Reservation;
+
+INSERT INTO Reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)
+VALUES (4, 1, '2025-02-19', '50108318', 'Parisa Mousavi', '[email protected]');
+
+INSERT INTO Reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)
+VALUES 
+(3, 2, '2025-02-19', '9123456789', 'Ali Rezai', '[email protected]'),
+
+(2, 3, '2025-02-19', '9356781234', 'Sara Mohammadi', '[email protected]'),
+
+(5, 4, '2025-02-19', '9012345678', 'Hossein Gholami', '[email protected]'),
+
+(4, 5, '2025-02-19', '9387654321', 'Leila Khosravi', '[email protected]'),
+
+(6, 1, '2025-02-19', '9154326789', 'Reza Farhadi', '[email protected]');
+
+
+SELECT * FROM Reservation WHERE id = 1;
+
+UPDATE Reservation 
+SET number_of_guests = 6, contact_name = 'Milad Zamani'
+WHERE id = 1;
+
+DELETE FROM Reservation WHERE id = 1;
+
+SELECT * FROM Review;
+
+INSERT INTO Review (title, description, meal_id, stars, created_date)
+VALUES ('Delicious meal', 'The pasta was amazing!', 1, 5, '2025-02-19');
+INSERT INTO Review (title, description, meal_id, stars, created_date)
+VALUES 
+('Amazing Kebab', 'The Koobideh was juicy and full of flavor!', 2, 5, '2025-02-19'),
+
+('Authentic Taste', 'Ghormeh Sabzi tasted just like home!', 3, 4, '2025-02-19'),
+
+('Rich and Delicious', 'Fesenjan had the perfect balance of sweet and sour.', 4, 5, '2025-02-19'),
+
+('Perfectly Cooked', 'The chicken in Zereshk Polo was so tender!', 5, 4, '2025-02-19'),
+
+('Aromatic and Flavorful', 'Baghali Polo with lamb shank was amazing.', 6, 5, '2025-02-19');
+
+
+SELECT * FROM Review WHERE id = 1;
+
+UPDATE Review 
+SET title = 'Amazing experience', stars = 4
+WHERE id = 1;
+
+DELETE FROM Review WHERE id = 1;
+
+SELECT * FROM Meal WHERE price < 90;
+
+SELECT * FROM Meal 
+WHERE max_reservations > (
+    SELECT COALESCE(SUM(number_of_guests), 0) FROM Reservation WHERE Meal.id = Reservation.meal_id
+);
+
+SELECT * FROM Meal WHERE title LIKE '%Rød grød med%';
+
+SELECT * FROM Meal WHERE created_date BETWEEN '2025-01-01' AND '2025-02-18';
+
+SELECT * FROM Meal LIMIT 5;
+
+SELECT DISTINCT Meal.* 
+FROM Meal 
+JOIN Review ON Meal.id = Review.meal_id 
+WHERE Review.stars >= 4;
+
+SELECT * FROM Reservation WHERE meal_id = 1 ORDER BY created_date;
+
+SELECT Meal.*, COALESCE(AVG(Review.stars), 0) AS average_rating
+FROM Meal
+LEFT JOIN Review ON Meal.id = Review.meal_id
+GROUP BY Meal.id
+ORDER BY average_rating DESC;

nodejs/week1/avg.js

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+// Excluding "node" and script name
+const args = process.argv.slice(2);
+
+// Convert to numbers
+const numbers = args.map(Number).filter(n => !isNaN(n));
+
+if (numbers.length>0) {
+    console.log(numbers.reduce((a, b) => a + b, 0) / numbers.length);
+
+} else {
+    console.log("Please provide valid numbers.");
+}

nodejs/week2/app.js

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+import express from 'express'
+import { searchRouter } from "./search.js"
+const app = express();
+const port = process.env.PORT || 3000;
+
+// Support parsing JSON requests
+app.use(express.json());
+app.use("/search", searchRouter);
+app.get("/", (req, res) => {
+  res.send("This is a search engine");
+});
+
+app.listen(port, () => {
+  console.log(`Listening on port ${port}`);
+});

nodejs/week2/documents.js

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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"
+    }
+]

nodejs/week2/search.js

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+import express from "express";
+import documents from "./documents.json" with { type: 'json' };
+
+export const searchRouter = express.Router();
+
+// GET: Fetch all documents or filter by query
+searchRouter.get("/", (req, res) => {
+    const query = req.query.q;
+
+    if (!query) {
+         res.status(200).json(documents);
+         return
+    }
+
+    const filteredResults = documents.filter(item =>
+        item.value?.toLowerCase().includes(query.toLowerCase())
+    );
+
+    res.status(200).json(filteredResults);
+});
+
+// GET: Fetch a document by ID
+searchRouter.get('/:id', (req, res) => {
+    const id = Number(req.params.id);
+    const document = documents.find(item => item.id === id);
+
+    if (!document) {
+        res.status(404).json({ message: "Not Found. Check your ID and try again." });
+        return 
+    }
+
+    res.status(200).json(document);
+});
+
+// POST: Filter documents based on provided fields
+searchRouter.post("/", (req, res) => {
+    const { fields } = req.body;
+
+    if (!fields || typeof fields !== "object") {
+        res.status(400).json({ message: "Invalid request body. Expected an object with fields." });
+        return
+    }
+
+    const filteredDocuments = documents.filter(item => {
+         Object.entries(fields).every(([key, value]) => item[key] === value);
+         return
+    });
+
+    res.status(200).json(filteredDocuments);
+});

nodejs/week3/.gitignore

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+node_modules
+.env