SELECT card_type_code ,  count(*) FROM Customers_cards GROUP BY card_type_code
Show all card type codes and the number of cards in each type.
SELECT card_type_code , count ( * ) FROM Customers_cards GROUP BY card_type_code
select card_type_code , count ( * ) from customers_cards group by card_type_code
Show all card type codes and the number of cards in each type .