Question: Can you tell me which customers do not have a first notification of loss record? | What attributes of the customers that do not have a first notification of loss record would you like to know? | Can you tell me their names?
SQL: SELECT customer_name FROM customers EXCEPT SELECT t1.customer_name FROM customers AS t1 JOIN first_notification_of_loss AS t2 ON t1.customer_id   =   t2.customer_id