query: SELECT first_name ,  last_name FROM Maintenance_Engineers WHERE engineer_id NOT IN (SELECT engineer_id FROM Engineer_Visits)
question: Which engineer finish never visit to maintain asset? List engineer first name and last name.
query_toks: SELECT first_name , last_name FROM Maintenance_Engineers WHERE engineer_id NOT IN ( SELECT engineer_id FROM Engineer_Visits )
query_toks_no_value: select first_name , last_name from maintenance_engineers where engineer_id not in ( select engineer_id from engineer_visits )
question_toks: Which engineer finish never visit to maintain asset? List engineer first name and last name.