แสดงคุณลักษณะทั้งหมดของผลิตภัณฑ์ชื่อ "งา" พร้อมรหัสประเภท "เกรด"
List all characteristics of product named "sesame" with type code "Grade".
df_characteristics = pd.DataFrame(columns=['characteristic_name', 'characteristic_id', 'characteristic_type_code'])
df_products = pd.DataFrame(columns=['product_id', 'product_name'])
df_product_characteristics = pd.DataFrame(columns=['product_id', 'characteristic_id'])
df_characteristics[(df_characteristics['characteristic_id'].isin(df_product_characteristics[df_product_characteristics['product_id'] == df_products[df_products['product_name'] == 'sesame']['product_id'].values[0]]['characteristic_id'])) & (df_characteristics['characteristic_type_code'] == 'Grade')]['characteristic_name'].values