CREATE TABLE Customers (Address_ID VARCHAR(255)); CREATE TABLE Addresses (City_Town VARCHAR(255), Address_ID VARCHAR(255)); CREATE TABLE Performers (Address_ID VARCHAR(255))
Show all cities where at least one customer lives in but no performer lives in.
    
SQL: 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