Could you please help me with the billing addresses of the named customers?
SELECT T1.FirstName, T1.lastname, T2.billingaddress FROM CUSTOMER AS T1 JOIN INVOICE AS T2 ON T1.CustomerId   =   T2.CustomerId
billing addresses of customers refers to T2.billingaddress; named customers refers to selecting customers by name which involves T1.FirstName and T1.lastname; joining customer and invoice tables on CustomerId to get billing addresses.