CMPLXSYS 391 มีชั้นเรียนภาคเช้าหรือไม่ ?ไม่จำเป็นต้องใช้ทุกโต๊ะ
Does CMPLXSYS 391 have morning classes ?It is not neccessary to use all the tables.
 comment_instructor:  instructor_id [ int]  student_id [ int]  score [ int]  comment_text [ varchar] 
SELECT COUNT(*) > 0 FROM course, course_offering, semester WHERE course_offering.start_time < '12:00:00' AND course_offering.start_time >= '08:00:00' AND course.course_id = course_offering.course_id AND course.department = 'CMPLXSYS' AND course.number = 391 AND semester.semester = 'WN' AND semester.semester_id = course_offering.semester AND semester.year = 2016