Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE instructor (dept_name VARCHAR, salary INTEGER)
### Question:
Find the name of the department which has the highest average salary of professors.
### Answer:
SELECT dept_name FROM instructor GROUP BY dept_name ORDER BY AVG(salary) DESC LIMIT 1