575 เสนอเมื่อใด ?ไม่จำเป็นต้องใช้ทุกตาราง
575 offered when ?It is not neccessary to use all the tables.
 gsi:  course_offering_id [ int]  student_id [ int] 
SELECT DISTINCT semester.semester, semester.year FROM course, course_offering, semester WHERE course.course_id = course_offering.course_id AND course.department = 'EECS' AND course.number = 575 AND course_offering.semester = semester.semester_id AND semester.semester_id > (SELECT SEMESTERalias1.semester_id FROM semester AS SEMESTERalias1 WHERE SEMESTERalias1.semester = 'WN' AND SEMESTERalias1.year = 2016) ORDER BY semester.semester_id LIMIT 1