表中的php mysql关系定义

Question

guys I've been trying to create create a school results management system.There is a STUDENT table and many COURSE tables. Each student must be linked to all Courses tables. eg JOHN, MARY,PETER must partake in MATHEMATICS, ENGLISH, ELECTROPHYSICS, PROGRAMMING etc
My problem is how to define this relationship in mysql and at same time let these students fetch only their own results in all the courses.

Answer 1

I don't know if you have a requirement to have each course in a separate COURSE table but that doesn't make much sense. You should have a STUDENT table and a COURSES table. Then, you will need a STUDENT_COURSES table to show which courses a student has taken or must take. Your table structure should be something like:

• STUDENT: Id, Name, Gender, etc
• STUDENT_COURSES: Id, Student_Id, Course_Id, Taken, Grade
• COURSES: Id, Course_Name

When a new student is created, you would need to add records to the STUDENT_COURSES table to insert the new STUDENT.Id into the Student_Id field and the Course_Id for each of the required courses. The default value for Taken would be false and the Grade would be Null or Empty String.

This is a very simplistic example and would not work in a real world solution because you would need to have Instructors, Locations, Etc. to make anything useful. But hopefully this will help you get started.