Context: CREATE TABLE Payments (booking_id VARCHAR); CREATE TABLE Bookings (booking_id VARCHAR, amount_of_refund VARCHAR)
Question: What are the id and the amount of refund of the booking that incurred the most times of payments?
Answer: SELECT T1.booking_id, T1.amount_of_refund FROM Bookings AS T1 JOIN Payments AS T2 ON T1.booking_id = T2.booking_id GROUP BY T1.booking_id ORDER BY COUNT(*) DESC LIMIT 1