SELECT city FROM addresses WHERE city NOT IN ( SELECT DISTINCT t3.city FROM customers AS t1 JOIN customer_addresses AS t2 ON t1.customer_id  =  t2.customer_id JOIN addresses AS t3 ON t2.address_id  =  t3.address_id)
What are the cities no customers live in?
SELECT city FROM addresses WHERE city NOT IN ( SELECT DISTINCT t3.city FROM customers AS t1 JOIN customer_addresses AS t2 ON t1.customer_id = t2.customer_id JOIN addresses AS t3 ON t2.address_id = t3.address_id )
select city from addresses where city not in ( select distinct t3 . city from customers as t1 join customer_addresses as t2 on t1 . customer_id = t2 . customer_id join addresses as t3 on t2 . address_id = t3 . address_id )
What are the cities no customers live in ?