39. Comparing Values

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 has a table that contains various products (3 in total):

CREATE TABLE Gadgets
(gid int identity(1,1) primary key,
gdesc varchar(25))
GO

Given an additional table that specifies customers, and the various products they own:

CREATE TABLE users
(userID int identity(1,1),
username varchar(25),
gdesc varchar(50))
GO

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