3065 - Expression #1 of ORDER BY clause is not in SELECT list, references column 'usr_web200_2.p.products_date_added' which is not in SELECT list; this is incompatible with DISTINCT

select distinct p.products_id, p.products_image, p.products_tax_class_id, p.products_price from products p, products_to_categories p2c, categories c where p.products_status=1 and p.products_id = p2c.products_id and p.products_id !='0' and c.categories_id = p2c.categories_id and c.categories_status=1 order by p.products_date_added desc limit 20

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