Task: Text to Code
Input (English): SQL: SELECT Count ( * ) FROM Products AS T1 WHERE T1.product_id NOT IN ( SELECT T2.product_id FROM Product_Characteristics AS T2 )
Feedback: Find all raws of distinct color code of reference colors instead of product id of product characteristics table .
Output (English): SELECT count(*) FROM Ref_colors WHERE color_code NOT IN ( SELECT color_code FROM products )