CREATE TABLE department (head VARCHAR, departmentID VARCHAR)
SELECT head FROM department GROUP BY departmentID ORDER BY COUNT(departmentID) LIMIT 1
รหัสพนักงานของหัวหน้าแผนกที่มีจำนวนพนักงานน้อยที่สุดคือข้อใด
What is the employee id of the head whose department has the least number of employees?