24. แบบจำลองของฐานข้อมูล (Database Diagram) ERD by Chen STUDENT SEAT fills 1 1 INSTRUCTOR COURSE teaches 1 N STUDENT COURSE takes N N PROFESSOR SECTION teaches 1 N COURSE SECTION has N N
25. แบบจำลองของฐานข้อมูล (Database Diagram) ERD by Chen SEAT 1 se_no se_pos teaches N fills s_id s_name s_addr STUDENT 1 takes N N has COURSE c_number c_name N INSTRUCTOR i_faculty i_name i_no 1 teaches PROFRESSOR p_faculty p_name p_id 1 SECTION s_number N N