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 Walmart chain store manages a table that specifies its sales over several months:


CREATE TABLE store_revenues
(sr_date date,
sr_department varchar(50),
sr_amount int)
GO

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