หมายเลขเลือกขั้นต่ำคือเท่าใดหากทีม NFL คือ San Diego Chargers?
what is the pick number minimum if the NFL team is the San Diego Chargers?
df = pd.DataFrame(columns=['pick__number', 'nfl_team'])
df[df['nfl_team'] == 'San Diego Chargers']['pick__number'].min()