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 students table. You can see that each row specifies the student’s first name, last name, and class.


CREATE TABLE students
(first_name varchar(25),
last_name  varchar(25),
class      varchar(25))
GO

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