What is the name of department where has the smallest number of professors?
create table professor (dept_code varchar, PRIMARY KEY (dept_code)); create table department (dept_name varchar, dept_code varchar, PRIMARY KEY (dept_name))
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