What are the different card types, and how many transactions have been made with each?
SELECT T2.card_type_code ,  count(*) FROM Financial_transactions AS T1 JOIN Customers_cards AS T2 ON T1.card_id  =  T2.card_id GROUP BY T2.card_type_code
SELECT T2.card_type_code ,  count(*) FROM Financial_transactions AS T1 JOIN Customers_cards AS T2 ON T1.card_id  =  T2.card_id GROUP BY T2.card_type_code
[{'card_type_code': 'Credit', 'count(*)': 7}, {'card_type_code': 'Debit', 'count(*)': 8}]