Database: student_club
Question: Among the members who incurred expenses in more than one event, who paid the most amount?
SQL: SELECT T2.member_id FROM expense AS T1 INNER JOIN member AS T2 ON T1.link_to_member = T2.member_id INNER JOIN budget AS T3 ON T1.link_to_budget = T3.budget_id INNER JOIN event AS T4 ON T3.link_to_event = T4.event_id GROUP BY T2.member_id HAVING COUNT(DISTINCT T4.event_id) > 1 ORDER BY SUM(T1.cost) DESC LIMIT 1