Which school have the highest student enrollment? How many of those students are filed for bankruptcy?
highest student enrollment refers to MAX(COUNT(school));
SELECT T.school, num FROM ( SELECT T1.school, COUNT(T2.name) AS num FROM enrolled AS T1 LEFT JOIN filed_for_bankrupcy AS T2 ON T2.name = T1.name GROUP BY T1.school ) T ORDER BY T.num DESC LIMIT 1