This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
Given the following tables:
Customer table – each row specifies the customer number, name, and city of residence.
CREATE TABLE Customers
(CustomerID int identity(1,1),
CustomerName varchar(25),
CityID int)
GO

City table – this table contains the names of cities for the customer table.
CREATE TABLE Cities
(CityID int identity(1,1),
CityName varchar(25))
GO
