Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE staff ( last_name VARCHAR, staff_id VARCHAR )
TABLE: 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?

### Accurate SQL ###

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