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 electronics store manages the following Gadgets table. This table contains the gadget name, number, and type:


CREATE TABLE gadgets
(GadgetID int identity(1,1),
GadgetName varchar(50),
GadgetType varchar(50))
GO

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