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Exercise #30 (tips and solutions)

To solve a problem of doubling, trebling of results, it is enough to execute corresponding grouping over each table beforehand, and already then to do joining them. Then this exercise reduces to a exercise 29, the solution of which did not cause issues and consequently is not included in the book.

It not a unique way to solve a problem. Visit a forum of the site to meet other approaches to solution.

To return to discussion of exercise #30

To solve a problem on SQL-EX.RU

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