SELECT T1.City_Town FROM Addresses AS T1 JOIN Customers AS T2 ON T1.Address_ID  =  T2.Address_ID EXCEPT SELECT T1.City_Town FROM Addresses AS T1 JOIN Performers AS T2 ON T1.Address_ID  =  T2.Address_ID
Show all cities where at least one customer lives in but no performer lives in.
SELECT T1.City_Town FROM Addresses AS T1 JOIN Customers AS T2 ON T1.Address_ID = T2.Address_ID EXCEPT SELECT T1.City_Town FROM Addresses AS T1 JOIN Performers AS T2 ON T1.Address_ID = T2.Address_ID
select t1 . city_town from addresses as t1 join customers as t2 on t1 . address_id = t2 . address_id except select t1 . city_town from addresses as t1 join performers as t2 on t1 . address_id = t2 . address_id
Show all cities where at least one customer lives in but no performer lives in .