Access | Advanced queries exercise | Grouping - billionaires
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You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
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Open the database in the above folder.
Create a query showing the average age of billionaires for each country, and the number there are, sorted so that the highest average age appears first. Your final query should look like this:
Russia has 12 billionaires, with a remarkably young average age
Save this query as BillionairesAnalysed, then close down your database.