ค้นหาชื่อผลิตภัณฑ์ที่มีสี 'สีขาว' แต่ไม่มีหน่วยวัด "Handful"
Find the product names that are colored 'white' but do not have unit of measurement "Handful".
products_df = pd.DataFrame(columns = ['product_name', 'product_category_code', 'color_code']); ref_colors_df = pd.DataFrame(columns = ['color_code', 'color_description']); ref_product_categories_df = pd.DataFrame(columns = ['product_category_code', 'unit_of_measure'])
products_df.loc[(products_df['color_code']==ref_colors_df.loc[ref_colors_df['color_description']=='white', 'color_code'].values[0]) & (products_df['product_category_code']!=ref_product_categories_df.loc[ref_product_categories_df['unit_of_measure']=='Handful', 'product_category_code'].values[0]), 'product_name']