ระบุชื่อที่แตกต่างกันทั้งหมดของผลิตภัณฑ์ด้วยชื่อลักษณะเฉพาะ 'อบอุ่น'
List the all the distinct names of the products with the characteristic name 'warm'.
df_characteristics = pd.DataFrame(columns=['characteristic_id', 'characteristic_name'])
df_products = pd.DataFrame(columns=['product_name', 'product_id'])
df_product_characteristics = pd.DataFrame(columns=['product_id', 'characteristic_id'])
df_products[df_products['product_id'].isin(df_product_characteristics[df_product_characteristics['characteristic_id'].isin(df_characteristics[df_characteristics['characteristic_name'] == 'warm']['characteristic_id'])]['product_id'])]['product_name'].unique()