show the customer ids, first name and last name without a Debit card
SELECT customer_id ,  customer_first_name ,customer_last_name FROM Customers EXCEPT SELECT T1.customer_id ,  T2.customer_first_name,T2.customer_last_name  FROM Customers_cards AS T1 JOIN Customers AS T2 ON T1.customer_id   =   T2.customer_id WHERE card_type_code   =   "Debit"
without a Debit card refers to excluding customers with a Debit card;