## students

id | name | date_of_birth
--- | --- | ---
1 | John Doe | 2003-01-01
2 | Jane Smith | 2002-06-27
3 | Alice Johnson | 2001-12-18
4 | Bob Brown | 2000-09-05
5 | Emma Davis | 1999-03-19

## subjects

subject_id | subject_name
--- | ---
1 | Mathematics
2 | English Literature
3 | Physics
4 | Chemistry
5 | Biology

## enrollments

student_id | subject_id
--- | ---
(→ students.id) | (→ subjects.subject_id)
1 | 1
2 | 2
3 | 3
4 | 4
5 | 5

## learning_materials

material_id | subject_id | materials | difficulty_level
--- | --- | --- | ---
| (→ subjects.subject_id) |  |
1 | 1 | Textbook | Intermediate
2 | 2 | Video Lectures | Advanced
3 | 3 | Textbook | Beginner
4 | 4 | Online Course | Intermediate
5 | 5 | Ebooks | Advanced