เซ็นเตอร์ที่เข้าร่วม Oral Roberts เล่นให้กับ Rockets กี่ครั้ง?
How many times did a center that attended Oral Roberts play for the Rockets?
df = pd.DataFrame(columns=['years_for_rockets', 'position', 'school_club_team_country'])
df[(df['position'] == 'Center') & (df['school_club_team_country'] == 'Oral Roberts')]['years_for_rockets'].count()