A list of the top 8 countries by gross/total invoice size. List country name and gross invoice size.
SELECT billing_country ,  SUM(total) FROM invoices GROUP BY billing_country ORDER BY SUM(total) DESC LIMIT 8;
Brüt/toplam fatura boyutuna göre en iyi 8 ülkenin listesi.Ülke adını ve brüt fatura boyutunu listeleyin.