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.
A space station manager uses the following table to specify various types of spaceships at his disposal:
CREATE TABLE starship_classes (Id INT IDENTITY(1,1), Class1 VARCHAR(25), Class2 VARCHAR(25)) GO