คลาสใดจะง่ายกว่าหากตัวเลือกอยู่ระหว่าง EECS 555 และ EECS 651 ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What class is easier if the choice is between EECS 555 and EECS 651 ?It is not neccessary to use all the tables.
 gsi:  course_offering_id [ int]  student_id [ int] 
SELECT DISTINCT course.number FROM course INNER JOIN program_course ON program_course.course_id = course.course_id WHERE (course.number = 555 OR course.number = 651) AND program_course.workload = (SELECT MIN(PROGRAM_COURSEalias1.workload) FROM program_course AS PROGRAM_COURSEalias1 INNER JOIN course AS COURSEalias1 ON PROGRAM_COURSEalias1.course_id = COURSEalias1.course_id WHERE (COURSEalias1.number = 555 OR COURSEalias1.number = 651) AND COURSEalias1.department = 'EECS')