Map the object classes created in Online Learning System above into database tables. Make necessary assumptions

In an Online Learning System, the various components such as courses, users, instructors, assignments, and other entities can be modeled as object classes in an Object-Oriented Analysis and Design (OOAD) approach. These object classes can then be mapped into corresponding database tables, keeping in mind the relationships between these entities, and ensuring that the data is stored efficiently for retrieval and modification. Below is an analysis of how the object classes from the Online Learning System can be mapped into database tables, along with necessary assumptions.

### 1. User Class to Users Table

The User class typically represents the individuals who interact with the system. This can be further divided into different types of users, such as students, instructors, and administrators. 

- Attributes of User Class: 
  - `user_id` (Primary Key): Unique identifier for the user.
  - `username`: User’s chosen name for login.
  - `email`: User’s email address.
  - `password`: Encrypted password for authentication.
  - `role`: The type of user (e.g., Student, Instructor, Admin).
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