SELECT email_address ,  phone_number FROM customers WHERE customer_id NOT IN (SELECT customer_id FROM complaints)
What are the emails and phone numbers of custoemrs who have never filed a complaint?
SELECT email_address , phone_number FROM customers WHERE customer_id NOT IN ( SELECT customer_id FROM complaints )
select email_address , phone_number from customers where customer_id not in ( select customer_id from complaints )
What are the emails and phone numbers of custoemrs who have never filed a complaint ?