Which shipping method is preferred by customers the most?
shipping method preferred the most by customers refers to method_id where Max(Count(method_id)); which shipping method refers to method_name
SELECT T2.method_name FROM cust_order AS T1 INNER JOIN shipping_method AS T2 ON T1.shipping_method_id = T2.method_id GROUP BY T2.method_name ORDER BY COUNT(T2.method_id) DESC LIMIT 1