Which department has the least number of employees?
select * from department as t1 join physician as t2 on t1.head = t2.employeeid group by departmentid order by count ( departmentid ) limit 1
What is the name of the department head of General Medicine?
select t2.name from department as t1 join physician as t2 on t1.head = t2.employeeid where t1.name = 'General Medicine'
Thank you!  What is Percival Cox's position?
select position from physician where name = "Percival Cox"