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.

An international freight forwarder company manages a table that contains information about its employees. As seen in the table, each row displays the employee number, and the department where the employee works.

CREATE TABLE employees
(employeeID int identity(1,1),
departmentID int)

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