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 contains information about its various sales. This table displays the number of the sale, the sale date, the salesman who made the sale, the salesman’s department number, and the total sum of the sale.


CREATE TABLE sales
(saleID int identity(1,1),
saleDate date,
salesPerson varchar(25),
departmentID int,
amountSold int)

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