Student
-------
name    id    username    phone-number
Sally   1     sallyjones  222-3333
Joe     2     joesmith    111-4444


Course
------
name           id    semester       area       students
Algorithms     1     spring2022     CS


Registration        many-to-many relationship
------------
id     student_id        course_id
1      1                 1


  id           =  primary key
  student_id   =  foreign key