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99. Average Difference

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 the following products table. As seen here, this table contains 9 products, each row indicates the product number, name, and price.


CREATE TABLE products
(p_id int identity(1,1),
p_name varchar(25),
p_price int)

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