Can you list the customer names and ids who have credit cards?
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 T1.card_type_code   =   "Credit"
customer names = customer_first_name, customer_last_name; customer ids = customer_id; those who have credit cards refer to a condition where card_type_code = 'Credit';