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.
Questo esercizio fa parte del corso
Introduction to Oracle SQL
Istruzioni dell'esercizio
- Run the query. Note that it throws an error.
- Adapt the query to show countries with more than four customers.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
-- Adapt the query below to show the correct results
SELECT Country, COUNT(*) AS Customers
FROM Customer
WHERE COUNT(*) > 4
GROUP BY Country