SELECT t2.color_description FROM products AS t1 JOIN ref_colors AS t2 ON t1.color_code  =  t2.color_code GROUP BY t2.color_description ORDER BY count(*) ASC LIMIT 1
What is the description of the color used by least products?
SELECT t2.color_description FROM products AS t1 JOIN ref_colors AS t2 ON t1.color_code = t2.color_code GROUP BY t2.color_description ORDER BY count ( * ) ASC LIMIT 1
select t2 . color_description from products as t1 join ref_colors as t2 on t1 . color_code = t2 . color_code group by t2 . color_description order by count ( * ) asc limit value
What is the description of the color used by least products ?