SELECT customer_name ,  customer_phone FROM customers WHERE customer_id NOT IN (SELECT customer_id FROM customer_address_history)
Show names and phones of customers who do not have address information.
SELECT customer_name , customer_phone FROM customers WHERE customer_id NOT IN ( SELECT customer_id FROM customer_address_history )
select customer_name , customer_phone from customers where customer_id not in ( select customer_id from customer_address_history )
Show names and phones of customers who do not have address information .