แผนกใดที่ให้หน่วยกิตรวมกันมากที่สุด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which department offers the most credits all together?It is not neccessary to use all the tables.
 professor:  emp_num [ number]  dept_code [ text]  prof_office [ text]  prof_extension [ text]  prof_high_degree [ text] 
SELECT T3.dept_name FROM course AS T1 JOIN class AS T2 ON T1.crs_code = T2.crs_code JOIN department AS T3 ON T1.dept_code = T3.dept_code GROUP BY T1.dept_code ORDER BY SUM(T1.crs_credit) DESC LIMIT 1