สโมสรที่มีโค้ชมากที่สุดชนะได้กี่เหรียญทอง?
How many gold medals has the club with the most coaches won?
df_match_result = pd.DataFrame(columns=['club_id', 'gold']); df_coach = pd.DataFrame(columns=['club_id'])
df_match_result[df_match_result['club_id'].isin(df_coach.groupby('club_id').size().idxmax())]['gold'].count()