วิทยาลัยใดมีคะแนนรวมน้อยกว่า 315 ในรอบ 17?
Which college had an overall smaller than 315 in round 17?
df = pd.DataFrame(columns = ['college', 'overall', 'round'])
df[(df['overall'] < '315') & (df['round'] == '17')]['college']