ขนาดของชั้นเรียนที่ใหญ่ที่สุดจากหลักสูตรแกนกลางที่ยากน้อยที่สุด ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which class size is largest out of the least difficult Core courses ?It is not neccessary to use all the tables.
 ta:  campus_job_id [ int]  student_id [ int]  location [ varchar] 
SELECT DISTINCT department, name, number FROM course WHERE course_id IN (SELECT PROGRAM_COURSE_ID FROM program_course AS PROGRAM_COURSE WHERE PROGRAM_WORKLOAD = (SELECT MIN(PROGRAM_COURSEalias1.workload) FROM program_course AS PROGRAM_COURSEalias1 WHERE PROGRAM_COURSEalias1.category LIKE '%Core%')) AND num_enrolled = (SELECT MAX(COURSEalias1.num_enrolled) FROM course AS COURSEalias1 WHERE COURSEalias1.course_id IN (SELECT PROGRAM_COURSEalias2.course_id FROM program_course AS PROGRAM_COURSEalias2 WHERE PROGRAM_COURSEalias2.workload = (SELECT MIN(PROGRAM_COURSEalias3.workload) FROM program_course AS PROGRAM_COURSEalias3 WHERE PROGRAM_COURSEalias3.category = 'Core')))