Which customers do not have any policies? Find the details of these customers.
SELECT customer_details FROM Customers EXCEPT SELECT T1.customer_details FROM Customers AS T1 JOIN Customer_Policies AS T2 ON T1.customer_id  =  T2.customer_id
Hangi müşterilerin herhangi bir politikası yok?Bu müşterilerin ayrıntılarını bulun.