See if there are any customers who have a different city listed in their billing city versus their customer city.
Here is the code i put. Also the quiz uses this database https://ucde-rey.s3.amazonaws.com/DSV1015/ChinookDatabaseSchema.png
SELECT Customers.CustomerId
,FirstName
,LastName
,Customers.City
,Invoices.BillingCity
FROM Customers left join Invoices