SELECT customer_id ,  count(*) FROM Customers_cards GROUP BY customer_id ORDER BY count(*) DESC LIMIT 1
Return the id of the customer who has the most cards, as well as the number of cards.
SELECT customer_id , count ( * ) FROM Customers_cards GROUP BY customer_id ORDER BY count ( * ) DESC LIMIT 1
select customer_id , count ( * ) from customers_cards group by customer_id order by count ( * ) desc limit value
Return the id of the customer who has the most cards , as well as the number of cards .