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Access | Joins exercise | Joins - company to billionaire
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Open the database in the above folder.
Create a query showing the number of countries which appear in the Biggest Companies table and not in the Billionaires table. This is harder than it looks, as you will have to apply grouping to get only the unique countries to appear:
There are more discrepancies than this, but after stripping out duplicates you get these six countries
Save this query as JoinByCompany.
Create another query showing the number of countries which appear in the Billionaires table but not in the Biggest Companies table:
Billionaires are more widely distributed geographically than successful companies?
Save this query as JoinByBillionaire, then close it and the database down.