ผลิตภัณฑ์ "ยี่หร่า" มีลักษณะเฉพาะที่แตกต่างกันกี่ชื่อ?
How many distinct characteristic names does the product "cumin" have?
df_characteristics = pd.DataFrame(columns=['characteristic_name', 'characteristic_id'])
df_products = pd.DataFrame(columns=['product_id', 'product_name'])
df_product_characteristics = pd.DataFrame(columns=['product_id', 'characteristic_id'])
df_characteristics['characteristic_name'][df_characteristics['characteristic_id'].isin(df_product_characteristics[df_product_characteristics['product_id'] == df_products[df_products['product_name'] == 'cumin']['product_id'].values[0]]['characteristic_id'])].nunique()