Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE professor ( dept_code VARCHAR )
TABLE: CREATE TABLE department ( dept_name VARCHAR, dept_code VARCHAR )

### Question ###
What is the name of department where has the smallest number of professors?

### Accurate SQL ###

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