ชื่อลักษณะเฉพาะที่ใช้โดยผลิตภัณฑ์ส่วนใหญ่คืออะไร?
What is the characteristic name used by most number of the products?
products_df = pd.DataFrame(columns = ['product_id']); characteristics_df = pd.DataFrame(columns = ['characteristic_name', 'characteristic_id']); product_characteristics_df = pd.DataFrame(columns = ['product_id', 'characteristic_id'])
characteristics_df.loc[product_characteristics_df['characteristic_id'].mode()[0],'characteristic_name']