แสดงชื่อและความโดดเด่นของภูเขาที่ไม่ได้ถ่ายด้วยเลนส์ยี่ห้อ 'Sigma'
Show the name and prominence of the mountains whose picture is not taken by a lens of brand 'Sigma'.
df_camera_lens = pd.DataFrame(columns=['id', 'brand']); df_mountain = pd.DataFrame(columns=['name', 'prominence', 'id']); df_photos = pd.DataFrame(columns=['mountain_id', 'camera_lens_id']); df_mountain = pd.DataFrame(columns=['name', 'prominence'])
df_mountain[~df_mountain['id'].isin(df_photos[df_photos['camera_lens_id'].isin(df_camera_lens[df_camera_lens['brand'] == 'Sigma']['id'])]['mountain_id'])][['name', 'prominence']]