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 stock exchange trading company manages the following table. This table reflects the changes in the dollar rate over several days:

CREATE TABLE ExchangeRates
(id int identity(1,1),
rateDate date,
rate numeric(4,2))

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