query: SELECT billing_country ,  AVG(total) FROM invoices GROUP BY billing_country ORDER BY AVG(total) DESC LIMIT 10;
question: One list the top 10 countries average invoice size. List countrys name and average invoice size.
query_toks: SELECT billing_country , AVG ( total ) FROM invoices GROUP BY billing_country ORDER BY AVG ( total ) DESC LIMIT 10 ;
query_toks_no_value: select billing_country , avg ( total ) from invoices group by billing_country order by avg ( total ) desc limit value
question_toks: One list the top 10 countries average invoice size. List countrys name and average invoice size.