SELECT billing_country ,  AVG(total) FROM invoices GROUP BY billing_country ORDER BY AVG(total) DESC LIMIT 10;
What are the names of the countries and average invoice size of the top countries by 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
What are the names of the countries and average invoice size of the top countries by size ?