text: 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 employee (emp_fname VARCHAR, emp_num VARCHAR); CREATE TABLE CLASS (prof_num VARCHAR)
  ### Question:
  Find the first names of professors who are teaching more than one class.
  ### Answer:
  SELECT T2.emp_fname FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num = T2.emp_num GROUP BY T1.prof_num HAVING COUNT(*) > 1