students

idnamedate_of_birth
1John Doe2003-01-01
2Jane Smith2002-06-27
3Alice Johnson2001-12-18
4Bob Brown2000-09-05
5Emma Davis1999-03-19

subjects

subject_idsubject_name
1Mathematics
2English Literature
3Physics
4Chemistry
5Biology

enrollments

student_idsubject_id
(→ students.id)(→ subjects.subject_id)
11
22
33
44
55

learning_materials

material_idsubject_idmaterialsdifficulty_level
(→ subjects.subject_id)
11TextbookIntermediate
22Video LecturesAdvanced
33TextbookBeginner
44Online CourseIntermediate
55EbooksAdvanced