Question: I want to know the customer names and how many credit cards they have?
SQL: SELECT T2.customer_first_name, T2.customer_last_name, count ( * )  FROM Customers_cards AS T1 JOIN Customers AS T2 ON T1.customer_id   =   T2.customer_id WHERE T1.card_type_code   =   "Credit" group by T1.customer_id