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 staff (last_name VARCHAR, staff_id VARCHAR); CREATE TABLE complaints (staff_id VARCHAR, date_complaint_raised VARCHAR)
  ### Question:
  What is the last name of the staff who has handled the first ever complaint?
  ### Answer:
  SELECT t1.last_name FROM staff AS t1 JOIN complaints AS t2 ON t1.staff_id = t2.staff_id ORDER BY t2.date_complaint_raised LIMIT 1