ฉันจะรับ 421 ได้เมื่อใด ?ไม่จำเป็นต้องใช้ทุกตาราง
When can I take 421 ?It is not neccessary to use all the tables.
 area:  course_id [ int]  area [ varchar] 
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 = 421 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