ในฤดูใบไม้ผลิ ใครสอน CDB 683 ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
In the Spring , who teaches CDB 683 ?It is not neccessary to use all the tables.
 course_offering:  offering_id [ int]  course_id [ int]  semester [ int]  section_number [ int]  start_time [ time]  end_time [ time]  monday [ varchar]  tuesday [ varchar]  wednesday [ varchar]  thursday [ varchar]  friday [ varchar]  saturday [ varchar]  sunday [ varchar]  has_final_project [ varchar]  has_final_exam [ varchar]  textbook [ varchar]  class_address [ varchar]  allow_audit [ varchar] 
SELECT DISTINCT instructor.name FROM course INNER JOIN course_offering ON course.course_id = course_offering.course_id INNER JOIN offering_instructor ON offering_instructor.offering_id = course_offering.offering_id INNER JOIN instructor ON offering_instructor.instructor_id = instructor.instructor_id INNER JOIN semester ON semester.semester_id = course_offering.semester WHERE course.department = 'CDB' AND course.number = 683 AND semester.semester = 'Spring' AND semester.year = 2016