Database: customers_card_transactions
Question: What are the ids and full names of customers who hold two or more cards?
SQL:
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 GROUP BY T1.customer_id HAVING count(*)  >=  2