แผนกใดมีจำนวนพนักงานมากที่สุด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which department has the largest number of employees?It is not neccessary to use all the tables.
 department:  (name [ VARCHAR ] departmentID [ VARCHAR) ]
SELECT name FROM department GROUP BY departmentID ORDER BY COUNT(departmentID) DESC LIMIT 1