SELECT billing_country ,  AVG(total) FROM invoices GROUP BY billing_country ORDER BY AVG(total) DESC LIMIT 10;
A list of the top 10 countries by average invoice size. List country name and average invoice size.
SELECT billing_country , AVG ( total ) FROM invoices GROUP BY billing_country ORDER BY AVG ( total ) DESC LIMIT 10 ;
select billing_country , avg ( total ) from invoices group by billing_country order by avg ( total ) desc limit value
A list of the top 10 countries by average invoice size . List country name and average invoice size .