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## Appendix: Relationships between elements in the database
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**Sprint3**
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All information is classified as 6 tables: s_admin, s_selected_course, s_course, s_clazz, s_student, s_teacher.
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**Sprint4**
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Set up a new table: s_attendance.
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s_attendance: uses **id** as primary key, and stores course_id, type, student_id and date at the same time.
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s_attendance: uses **id** as primary key, and stores course_id, type, student_id and date at the same time. Besides, course_id and student_id **must relatively stay the same as** id in s_course and id in s_student.
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\ No newline at end of file |
