รอบใดที่น้อยกว่า 545 โดยรวมสำหรับ San Francisco Giants?
What round was less than 545 overall for San Francisco Giants?
df = pd.DataFrame({'round': pd.Series(dtype='str'), 'overall': pd.Series(dtype='str'), 'mlb_team': pd.Series(dtype='str')})
df.loc[(df['overall'].astype(int) < 545) & (df['mlb_team'] == 'san francisco giants'), 'round']