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.

In this exercise you perform the opposite operation of the previous task. This exercise begins at a point where each row specifies the name of the city (in one field) and the various customers who live in that city (in the second field).

(CustomerCity varchar(25),
CustomerName varchar(250))

Would you like to read more?