instruction: Of the classes I 've completed , which is considered most difficult ?
response: SELECT DISTINCT course.department, course.name, course.number, program_course.workload FROM course INNER JOIN student_record ON student_record.course_id = course.course_id INNER JOIN program_course ON program_course.course_id = course.course_id WHERE program_course.workload = (SELECT MAX(PROGRAM_COURSEalias1.workload) FROM program_course AS PROGRAM_COURSEalias1 INNER JOIN student_record AS STUDENT_RECORDalias1 ON STUDENT_RECORDalias1.course_id = PROGRAM_COURSEalias1.course_id WHERE STUDENT_RECORDalias1.student_id = 1) AND student_record.student_id = 1