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 a Categories and Suppliers table. This table contains an indication of the various categories each supplier markets. For example, supplier no. 1 markets alcohol, tea, and coffee products.

CREATE TABLE products_and_suppliers
(productID int identity(1,1),
categoryName varchar(50),
supplier1 int,
supplier2 int,
supplier3 int,
supplier4 int)


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