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Mastering SQL: How to Use GROUP BY and SUM Effectively

Mastering SQL: How to Use GROUP BY and SUM Effectively

Learn how to use SQL's `GROUP BY` and `SUM` functions together, with practical examples and clear explanations to improve your database queries. --- This video is based on the question https://stackoverflow.com/q/63885971/ asked by the user 'Lucas Prestes' ( https://stackoverflow.com/u/6427078/ ) and on the answer https://stackoverflow.com/a ...

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