ฉันขอ 503 วันจันทร์และวันพุธได้ไหม ไม่จำเป็นต้องใช้ทุกตาราง
Could I take 503 Mondays and Wednesdays ?It is not neccessary to use all the tables.
 instructor:  instructor_id [ int]  name [ varchar]  uniqname [ varchar] 
SELECT COUNT(*) > 0 FROM course, course_offering, semester WHERE course_offering.friday = 'N' AND course_offering.monday = 'Y' AND course_offering.thursday = 'N' AND course_offering.tuesday = 'N' AND course_offering.wednesday = 'Y' AND course.course_id = course_offering.course_id AND course.department = 'EECS' AND course.number = 503 AND semester.semester = 'WN' AND semester.semester_id = course_offering.semester AND semester.year = 2016