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 a table that displays a schedule for several basketball games, by dates. As seen below, some of the games took place as planned, while other games were canceled:

CREATE TABLE games_log
(log_date date,
game1 varchar(25),
game2 varchar(25),
game3 varchar(25),
game4 varchar(25))

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