Database choice for creating two connected tables?

Question

I have to database tables \"Courses\" and \"Students\".

• Courses table has columns (\"_id\", \"course_name\", \"course_number\").
• Student table has column

Answer 1

There is m to n relationship between Courses and Students. To map a m to n relationship you need a third table.

courses_students
----------------
id_student
id_course

courses
----------------
id_course
// other fields

students
----------------
id_student
// other fields

Answer 2

Student (id, name, number) Course (id, name, number) StudentsCourses (student_id, course_id)

You have to make a many to many relation.

Answer 3

This is a classic case of many-to-many, and for that, you'll need a third table between Course and Student. The schema will look something like this:

Course table has columns ("course_id", "course_name")

Student_course table has columns ("student_id", "course_id");

Student table as columns ("student_id", "student_name")

Student_course table has foreign key constraints on both student and course tables.

Example data:

Course:

id   |  name
------------------
1    |  Maths
2    |  English
3    |  Science

Student

id   |  name
---------------
1    |  Tom
2    |  Dick
3    |  Harry

Student_course

student_id | course_id
------------------------
1          | 1
1          | 2
2          | 1
3          | 3

In this example, Student 1 (Tom) is on courses 1 and 2 (Maths, English),

Student 2 (Dick) is on course 1 only (Maths)

Student 3 (Harry) is on course 3 only (Science)