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
Return the last name of the staff member who handled the complaint with the earliest date raised.
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
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 value
Return the last name of the staff member who handled the complaint with the earliest date raised .