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 employees (department_id VARCHAR, salary INTEGER, commission_pct VARCHAR)
  ### Question:
  display the average salary of employees for each department who gets a commission percentage.
  ### Answer:
  SELECT department_id, AVG(salary) FROM employees WHERE commission_pct <> "null" GROUP BY department_id