What are the top 2 countries with the highest number of indebted suppliers?
country refers to c_name; highest number of indebted refers to max(sum(acctbal)) where s_acctbal < 0
SELECT T.n_name FROM ( SELECT T2.n_name, SUM(T1.s_acctbal) AS num FROM supplier AS T1 INNER JOIN nation AS T2 ON T1.s_nationkey = T2.n_nationkey WHERE T1.s_acctbal < 0 GROUP BY T1.s_nationkey ) AS T ORDER BY T.num LIMIT 2