สำหรับหลักสูตร Core ใครคือครูที่ง่ายที่สุด ?ไม่จำเป็นต้องใช้ทุกตาราง
For the Core course , who is the easiest teacher ?It is not neccessary to use all the tables.
 course:  course_id [ int]  name [ varchar]  department [ varchar]  number [ varchar]  credits [ varchar]  advisory_requirement [ varchar]  enforced_requirement [ varchar]  description [ varchar]  num_semesters [ int]  num_enrolled [ int]  has_discussion [ varchar]  has_lab [ varchar]  has_projects [ varchar]  has_exams [ varchar]  num_reviews [ int]  clarity_score [ int]  easiness_score [ int]  helpfulness_score [ int] 
SELECT DISTINCT instructor.name, program_course.workload FROM instructor INNER JOIN offering_instructor ON offering_instructor.instructor_id = instructor.instructor_id INNER JOIN course_offering ON offering_instructor.offering_id = course_offering.offering_id INNER JOIN program_course ON program_course.course_id = course_offering.course_id WHERE program_course.category LIKE '%Core%' AND program_course.workload = (SELECT MIN(PROGRAM_COURSEalias1.workload) FROM program_course AS PROGRAM_COURSEalias1 WHERE PROGRAM_COURSEalias1.category LIKE '%Core%')