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.
 

Technology news website gains profit from clicks on advertising banners located in the website’s various pages. Given a table that specifies the number of daily clicks:

CREATE TABLE websiteClicks   
(wdate date,   
nclicks int)  

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