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Exercise

Nest a subquery in FROM

What's the average number of matches per season where a team scored 5 or more goals? How does this differ by country?

Let's use a nested, correlated subquery to perform this operation. In the real world, you will probably find that nesting multiple subqueries is a task you don't have to perform often. In some cases, however, you may find yourself struggling to properly group by the column you want, or to calculate information requiring multiple mathematical transformations (i.e., an AVG of a COUNT).

Nesting subqueries and performing your transformations one step at a time, adding it to a subquery, and then performing the next set of transformations is often the easiest way to yield accurate information about your data. Let's get to it!

Instrukcje 1 / 3

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  • Generate a list of matches where at least one team scored 5 or more goals.