Nodejs-week2/yuusuf

databases/week1/data.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 * 
+FROM task 
+WHERE status_id = 3; -- 3 is equal to done 
+
+
+-- 4. Find all the tasks that are not marked as done
+SELECT * 
+FROM task 
+WHERE status_id <> 3; -- numbers that are not 3 are either not started or in progress
+
+
+-- 5. Get all the tasks, sorted with the most recently created first
+SELECT * 
+from task 
+ORDER BY CREATED DESC;
+
+
+-- 6. Get the single most recently created task
+SELECT * 
+from task 
+ORDER BY CREATED DESC limit 1;
+
+
+-- 7. Get the title and due date of all tasks where the title or description contains database
+SELECT title,due_date 
+from task 
+WHERE title like '%database%' OR description like '%database%';
+
+
+-- 8. Get the title and status (as text) of all tasks
+SELECT task.title AS tt, status.name AS sn 
+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 AS sn, count(task.title) AS tc 
+FROM task 
+JOIN status 
+WHERE task.status_id = status.id 
+GROUP BY status.id;
+
+
+-- 10. Get the names of all statuses, sorted by the status with most tasks first
+SELECT status.name AS sn, count(task.title) AS tc 
+FROM task 
+JOIN status 
+WHERE task.status_id = status.id 
+GROUP BY status.id 
+ORDER BY tc DESC;

databases/week2/task1.sql

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+#Add a task with these attributes: title, description, created, updated, due_date, status_id, user_id
+INSERT INTO task (title, description, created, updated, due_date, status_id, user_id) 
+VALUES ('read a book', 'complete human laws of nature', '2024-12-01', '2024-12-18', '2025-1-01', 2, 3);
+
+
+#Change the title of a task
+update task
+set title = 'wash car'
+where id = 36;
+
+
+#Change a task due date
+update task
+set due_date = '2026-12-3'
+where id = 36;
+
+
+#Change a task status
+update task 
+set status_id = 3
+where id = 16;
+
+
+#Mark a task as complete
+update task 
+set status_id = 1 
+where id = 3;
+
+
+# Delete a task
+delete from task 
+where user_id  = 1;

databases/week2/task2.sql

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+create database School;
+use School;
+
+
+CREATE TABLE Class (
+    id INT PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    beginning_date DATE,
+    ending_date DATE
+);
+
+
+CREATE TABLE Student (
+    id INT PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    phone VARCHAR(255) NOT NULL,
+    class_id INT NOT NULL,
+    FOREIGN KEY (class_id) REFERENCES Class(id)
+);
+
+
+#Create an index on the name column of the student table.
+CREATE INDEX indexName ON Student(name);
+
+
+#Add a new column to the class table named status which can only have the following values: not-started, ongoing, finished (hint: enumerations).
+ALTER TABLE Class
+ADD status ENUM('not-started', 'ongoing', 'finished');    

databases/week2/task3.sql

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+--Get all the tasks assigned to users whose email ends in @spotify.com
+select * from task
+join user_task on task_id = user_task.task_id
+join user on user_task.task_id = user.id
+where user.email like '%@spotify.com';
+
+
+--Get all the tasks for 'Donald Duck' with status 'Not started'
+SELECT * 
+FROM task 
+JOIN user_task ON task.id = user_task.task_id
+join user on user_id = user.id
+JOIN status on status_id = status.id
+where user.name = 'Donald Duck' and status.name = 'not started';
+
+
+--Get all the tasks for 'Maryrose Meadows' that were created in september (hint: month(created)=month_number)
+select * from task
+join user_task on task.id = user_task.task_id
+join user on user.id = user_task.user_id
+where user.name = 'Maryrose Meadows' and month(created) = 9;
+
+
+--Find how many tasks where created in each month, e.g. how many tasks were created in october, how many tasks were created in november, etc. (hint: use group by)
+SELECT MONTH(created) AS month,
+COUNT(*) AS task_amount
+FROM task
+GROUP BY month;

databases/week2/task4.sql

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+CREATE TABLE Customers (
+    customer_id INT PRIMARY KEY,
+    name VARCHAR(255),
+    email VARCHAR(255),
+    address VARCHAR(255)
+);
+
+
+CREATE TABLE Products (
+    product_id INT PRIMARY KEY,
+    name VARCHAR(255),
+    price INT,
+    description VARCHAR(255)
+);
+
+
+CREATE TABLE Orders (
+    order_id INT PRIMARY KEY,
+    customer_id INT,
+    order_date DATE,
+    FOREIGN KEY (customer_id) REFERENCES Customers(customer_id)
+);
+
+
+CREATE TABLE Order_Items (
+    order_item_id INT PRIMARY KEY,
+    order_id INT,
+    product_id INT,
+    quantity INT,
+    FOREIGN KEY (order_id) REFERENCES Orders(order_id),
+    FOREIGN KEY (product_id) REFERENCES Products(product_id)
+);

databases/week3/additional_queries.sql

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+-- Get meals that has a price smaller than a specific price fx 90
+SELECT * from meal where price < 70;
+
+
+
+-- Get meals that still has available reservations
+SELECT meal.* FROM meal
+LEFT JOIN reservation ON reservation.meal_id = meal.id
+GROUP BY meal.id
+HAVING COUNT(reservation.id) < meal.max_reservations;
+
+
+
+-- Get meals that partially match a title. Rød grød med will match the meal with the title Rød grød med fløde
+SELECT * from meal where title LIKE '%rød grød med fløde%';
+
+
+
+-- Get meals that has been created between two dates
+SELECT * FROM meal WHERE created_date BETWEEN '2025-01-01' AND '2025-2-13';
+
+
+
+-- Get only specific number of meals fx return only 5 meals
+SELECT * from meal limit 2;
+
+
+
+-- Get the meals that have good reviews
+SELECT meal.title AS meal,meal.description,meal.location,review.title as review,review.description,review.stars from meal
+JOIN review on review.meal_id = meal.id
+WHERE review.stars >= 4
+
+
+
+-- Get reservations for a specific meal sorted by created_date
+SELECT * FROM meal
+join reservation on reservation.meal_id = meal.id
+where meal.id = 1
+order by reservation.created_date
+
+
+
+-- Sort all meals by average number of stars in the reviews
+SELECT meal.* ,avg(review.stars) as average_rate from meal
+join review on review.meal_id = meal.id
+group by meal.id
+order by average_rate desc;

databases/week3/db.sql

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+CREATE DATABASE meal_sharing;
+USE meal_sharing;
+
+
+--created the tables
+CREATE TABLE meal (
+    `id` INT PRIMARY KEY AUTO_INCREMENT,
+    `title` VARCHAR(255) NOT NULL,
+    `description` VARCHAR(255) NOT NULL,
+    `location` VARCHAR(255) NOT NULL,
+    `when` DATETIME NOT NULL,
+    `max_reservations` INT NOT NULL,
+    `price` DECIMAL(10, 0) NOT NULL,
+    `created_date` DATE NOT NULL
+)
+
+
+CREATE TABLE reservation (
+    `id` INT PRIMARY KEY AUTO_INCREMENT,
+    `number_of_guests` INT NOT NULL,
+    `meal_id` INT NOT NULL,
+    `created_date` DATE NOT NULL,
+    `contact_phonenumber` VARCHAR(255) NOT NULL,
+    `contact_name` VARCHAR(255) NOT NULL,
+    `contact_email` VARCHAR(255) NOT NULL,
+    FOREIGN KEY (meal_id) REFERENCES meal(id)
+)
+
+
+CREATE TABLE review (
+    `id` INT PRIMARY KEY AUTO_INCREMENT,
+    `title` VARCHAR(255) NOT NULL,
+    `description` VARCHAR(255) NOT NULL,
+    `meal_id` INT NOT NULL,
+    `stars` INT NOT NULL,
+    `created_date` DATE NOT NULL,
+    FOREIGN KEY (meal_id) REFERENCES meal(id)
+) 
+
+
+
+
+
+--data insertion for meal table
+insert into meal (title,description,location,`when`,max_reservations,price,created_date)
+VALUES ('Lasagna', 'Enjoy a delicious lasagna', 'Rome', '2025-05-01 10:00:00', 10, 50, '2025-02-15');
+
+insert into meal (title,description,location,`when`,max_reservations,price,created_date)
+VALUES ('Chicken biryani', 'Indian biryani', 'Mumbai', '2025-06-13 7:30:00', 8, 70, '2025-02-07');
+
+insert into meal (title,description,location,`when`,max_reservations,price,created_date)
+VALUES ('Samosa', 'Homemade Somali samosa', 'Mogadishu', '2025-07-25 22:14:00', 4, 100, '2025-02-22');
+
+
+--data insertion for reservation table
+INSERT INTO reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)
+VALUES (3, 1, '2025-04-02', '12345678', 'Benjamin Jensen', '[email protected]');
+
+INSERT INTO reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)  
+VALUES (5,2, '2025-03-13', '11223344', 'Mohamed Ali', '[email protected]');  
+
+INSERT INTO reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)  
+VALUES (4, 3, '2025-06-24', '87654321', 'Leyla Abdirahman', '[email protected]'); 
+
+
+--data insertion for review table
+INSERT INTO review (title, description, meal_id, stars, created_date)  
+VALUES ('Average', 'The meal was okay, but could be better.', 1, 3, '2025-05-02');
+
+INSERT INTO review (title, description, meal_id, stars, created_date)  
+VALUES ('Delicious Experience', 'The flavors were amazing!', 2, 4, '2025-06-18');  
+
+INSERT INTO review (title, description, meal_id, stars, created_date)
+VALUES ('Great Meal', 'Loved the food!', 3, 4, '2025-07-16');

databases/week3/meal.sql

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+--Get all meals
+SELECT * FROM meal;
+
+
+--Add a new meal
+insert into meal (title,description,location,`when`,max_reservations,price,created_date)
+VALUES ('Tacos', 'Mexican tacos', 'Mexico', '2025-09-01 15:30:00', 3, 25, '2025-02-26');
+
+
+--Get a meal with any id, fx 1
+SELECT * FROM meal WHERE id = 2;
+
+
+--Update a meal with any id, fx 1. Update any attribute fx the title or multiple attributes
+UPDATE meal set location = 'Pakistan' WHERE id = 2;
+
+
+--Delete a meal with any id, fx 1
+DELETE from meal WHERE id = 4;
+

databases/week3/reservation.sql

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+--Get all reservations
+SELECT * FROM reservation;
+
+
+--Add a new reservation
+INSERT INTO reservation (number_of_guests, meal_id, created_date, contact_phonenumber, contact_name, contact_email)  
+VALUES (6, 1, '2025-03-15', '34567890', 'Qays Qayser', '[email protected]');
+
+
+--Get a reservation with any id, fx 1
+SELECT * FROM reservation WHERE id = 3;
+
+
+--Update a reservation with any id, fx 1. Update any attribute fx the title or multiple attributes
+UPDATE reservation set contact_phonenumber = 34343434 WHERE id = 3;
+
+
+--Delete a reservation with any id, fx 1
+DELETE from reservation WHERE id = 4;
+
+
+
+
+

databases/week3/review.sql

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+--Get all reviews
+SELECT * FROM review;
+
+
+--Add a new review
+INSERT INTO review (title, description, meal_id, stars, created_date)
+VALUES ('Delicious biryani', 'The flavors were extraordinary!', 2, 5,'2025-06-19' );
+
+
+--Get a review with any id, fx 1
+SELECT * FROM review WHERE id = 2;
+
+
+--Update a review with any id, fx 1. Update any attribute fx the title or multiple attributes
+UPDATE review set title = 'Excellent' WHERE id = 3;
+
+
+--Delete a review with any id, fx 1
+DELETE from review WHERE id = 4;
+
+
+
+
+