Restricting groups
Earlier you created an overview of how many eSymphony customers live in each country. The output was a long list. Now, you want to restrict your results and only display countries with more than four customers. Since you grouped your output by country, you will now need to exclude values on a group-level rather than a row-level.
Deze oefening maakt deel uit van de cursus
Introduction to Oracle SQL
Oefeninstructies
- Run the query. Note that it throws an error.
- Adapt the query to show countries with more than four customers.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
-- Adapt the query below to show the correct results
SELECT Country, COUNT(*) AS Customers
FROM Customer
WHERE COUNT(*) > 4
GROUP BY Country