HackYourFuture-CPH · adamblanchard · Oct 28, 2025 · May 27, 2025 · May 27, 2025 · Jul 5, 2025
diff --git a/courses/Backend/databases/README.md b/courses/Backend/databases/README.md
@@ -1,8 +1,28 @@
 # Databases
 
-TODO
+This module is part of the Backend specialism course and goes deep on databases, including SQL topics like CRUD, relationships and other advanced concepts. It should also covers security and NoSQL on a theoretical level # TODO
 
-Lesson1 is already been covered in foundation. These is the remaining content:
+## Contents
 
-Week 1: [legacy lesson2](../../../legacy/databases/lesson2/)
-Week 2: [legacy lesson3](../../../legacy/databases/lesson3/)
+| Week | Topic                                | Preparation                           | Lesson Plan                                           | Assignment                          |
+| ---- | ------------------------------------ | ------------------------------------- | ----------------------------------------------------- | ----------------------------------- |
+| 1.   | [Introduction to Databases, Week 2](./week1/README.md) | [Preparation](./week1/preparation.md) | [Session Plan](./week1/session-plan.md) (for mentors) | [Assignment](./week1/assignment.md) |
+| 2.   | [# TODO - Review this content](./week2/README.md) | [Preparation](./week2/preparation.md) | [Session Plan](./week2/session-plan.md) (for mentors) | [Assignment](./week2/assignment.md) |
+
+## Module Learning Goals
+
+By the end of this module, you will be able to:
+
+- [ ] Explain the purpose of databases in web applications
+- [ ] Perform basic CRUD operations using SQL
+- [ ] Understand and implement relationships between tables in SQL
+- [ ] Write SQL queries involving joins and aggregations
+- [ ] Describe the differences between SQL and NoSQL databases
+- [ ] Performance?
+- [ ] Security?
+
+## Prerequisites
+
+You should have completed or understand the learning goals in the following modules before proceeding:
+
+- [ ] ?
diff --git a/courses/Backend/databases/week1/README.md b/courses/Backend/databases/week1/README.md
@@ -0,0 +1,37 @@
+# Introduction to Databases, Week 2
+
+This session is about building CRUD functionality using SQL statements and understanding database relationships.
+
+## Contents
+
+- [Preparation](./preparation.md)
+- [Session Plan](./session-plan.md) (for mentors)
+- [Assignment](./assignment.md)
+
+## Session Learning Goals
+
+By the end of this session, you will be able to:
+
+- [ ] Build CRUD functionality using SQL statements (INSERT INTO, UPDATE, DELETE)
+- [ ] Create an entity relationship diagram from a qualitative description of data requirements
+- [ ] Translate an entity relationship diagram into a database schema
+- [ ] Use simple foreign keys and join tables
+- [ ] Explain and model many-to-many relationships
+- [ ] Use aggregate functions (COUNT, AVG, SUM, MIN, MAX)
+- [ ] Describe the difference between relational and NoSQL databases (theoretical overview)
+
+
+## Main Topics
+
+- **CRUD operations:**
+  - **Create:** INSERT INTO
+  - **Read:** SELECT
+  - **Update:** UPDATE
+  - **Delete:** DELETE
+- **Introduction to relationships:**
+  - Simple foreign keys and joining tables (theory and simple examples)
+  - Many-to-many relationships (theory and simple examples)
+- **Aggregate functions:**
+  COUNT, AVG, SUM, MIN, MAX
+- **NoSQL:**
+  Brief theoretical overview only—focus remains on relational databases.
diff --git a/courses/Backend/databases/week1/assignment.md b/courses/Backend/databases/week1/assignment.md
@@ -0,0 +1,49 @@
+# Assignment
+
+## Part 1: Working with tasks
+
+Write the following sql queries:
+
+- Add a task with these attributes: `title, description, created, updated, due_date, status_id, user_id`
+- Change the title of a task
+- Change a task due date
+- Change a task status
+- Mark a task as complete
+- Delete a task
+
+In all the above queries, you choose which is the task that you will modify/delete.
+
+## Part 2: School database
+
+- Create a new database containing the following tables:
+  - **Class**: with the columns: id, name, begins (date), ends (date)
+  - **Student**: with the columns: id, name, email, phone, class_id (foreign key)
+- If you are done with the above tasks, you can continue with these advanced tasks:
+  - Create an index on the name column of the student table.
+  - Add a new column to the class table named **status** which can only have the following values: not-started, ongoing, finished (hint: enumerations).
+
+## Part 3: More queries
+
+You should do these queries on the database `hyf_lesson2`, which we created last class.
+You can find the data [here](lesson2-data.sql) if you need to create the DB again.
+
+- Get all the tasks assigned to users whose email ends in `@spotify.com`
+- Get all the tasks for 'Donald Duck' with status 'Not started'
+- Get all the tasks for 'Maryrose Meadows' that were created in september (hint: `month(created)=month_number`)
+- 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)
+
+## Part 4: Creating a database
+
+Using an entity relationship diagram, design the data model for an application of your choice. This can be anything, previous students have used a small business (with staff, offices, and job titles), a library (with books, genres, racks, members, and a borrowing log), or a farm (with animals, barns, and farmers).
+
+Your application must include at least one many-to-many relationship and any supporting tables (linking tables) that are needed. The entity relationship diagram must describe what tables you will need, the columns in these tables, which column is the primary key, and the relationships between tables.
+
+Next, using the entity relationship diagram as a starting point, write all the necessary `CREATE TABLE` statements to create all tables and relationships (foreign key constraints) for this data model.
+
+Submit an image or PDF of your entity relationship diagram, and a `.sql` file with the `CREATE TABLE` statements.
+
+### Hand in assignment
+
+Need to brush up on the homework hand-in process?
+
+Check [this resource](https://github.com/HackYourFuture-CPH/Git/blob/main/homework-submission.md) to remember how to hand in the homework correctly!
diff --git a/courses/Backend/databases/week1/preparation.md b/courses/Backend/databases/week1/preparation.md
@@ -0,0 +1,7 @@
+## Pre-Class Preparation
+
+- [Falsehoods Programmers Believe About Names](https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/)
+- [What is a Database Foreign Key](https://www.educative.io/blog/what-is-foreign-key-database)
+- [Example Entity Relationship Diagram (including associative entities)](https://users.csc.calpoly.edu/~jdalbey/308/Lectures/HOWTO-ERD.html)
+
+The students should watch this video before class: <https://youtu.be/9hTKUT_SZWU>
diff --git a/courses/Backend/databases/week1/session-materials/articles_example.json b/courses/Backend/databases/week1/session-materials/articles_example.json
@@ -0,0 +1,50 @@
+[
+  {
+    "id": 1,
+    "authors": [
+      {
+        "id": 1,
+        "name": "James Smith"
+      },
+      {
+        "id": 2,
+        "name": "Jane Jones"
+      }
+    ],
+    "title": "BREAKING NEWS: Water is wet!",
+    "content": "Scientists have discovered that water is wet, it's amazing what.... ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.",
+    "tags": ["science", "breaking"]
+  },
+  {
+    "id": 2,
+    "authors": [
+      {
+        "id": 3,
+        "name": "Aliya Awad"
+      },
+      {
+        "id": 4,
+        "name": "Igor Vladimir"
+      }
+    ],
+    "title": "Heavy Snowfall Expected this Weekend",
+    "content": "Lots of snow is expected... Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
+    "tags": ["weather", "winter"]
+  },
+  {
+    "id": 3,
+    "authors": [
+      {
+        "id": 2,
+        "name": "Jane Jones"
+      },
+      {
+        "id": 5,
+        "name": "Kim Jensen"
+      }
+    ],
+    "title": "BREAKING NEWS: These 10 Clickbait Titles Are Bad for Your Health, Number 7 Will SHOCK You!",
+    "content": "Haha, you clicked! Minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat ",
+    "tags": ["clickbait", "breaking"]
+  }
+]
diff --git a/courses/Backend/databases/week1/session-plan.md b/courses/Backend/databases/week1/session-plan.md
@@ -0,0 +1,11 @@
+# Lesson Plan - Databases - Week 2
+
+## Queries
+
+1. Get all the tasks assigned to `Pavel`;
+2. Find how many tasks each user is responsible for;
+3. Find how many tasks with a `status=Done` each user is responsible for;
+
+## Design and implement a database for existing data
+
+Design an ER model and implement the respective database for the data in [this file](assets/articles_example.json).
diff --git a/courses/Backend/databases/week2/README.md b/courses/Backend/databases/week2/README.md
@@ -0,0 +1,7 @@
+# Introduction to Databases, Week 3
+
+## Learning Goals
+
+## Main Topics
+
+## Resources
diff --git a/courses/Backend/databases/week2/assignment.md b/courses/Backend/databases/week2/assignment.md
@@ -0,0 +1 @@
+# Assignment
diff --git a/courses/Backend/databases/week2/preparation.md b/courses/Backend/databases/week2/preparation.md
@@ -0,0 +1 @@
+## Pre-Class Preparation
diff --git a/courses/Backend/databases/week2/session-plan.md b/courses/Backend/databases/week2/session-plan.md
@@ -0,0 +1 @@
+# Lesson plan