What is the name of the department with the fewest professors?
SELECT T2.dept_name FROM professor AS T1 JOIN department AS T2 ON T1.dept_code  =  T2.dept_code GROUP BY T1.dept_code ORDER BY count(*) LIMIT 1
department with the fewest professors refers to MIN(COUNT(T1.dept_code)); name of the department refers to T2.dept_name; professors are associated with departments through dept_code;