3065 Expression #1 of ORDER BY clause is not in SELECT list, references column 'twe305.p.products_date_added' which is not in SELECT list; this is incompatible with DISTINCT
in:
[select distinct p.products_fsk18, p.products_id, p.products_image, p.products_discount_allowed, p.products_tax_class_id, p.products_price from products p left join specials s on p.products_id = s.products_id, products_to_categories p2c, categories c where c.categories_status='1' and p.products_id = p2c.products_id and p2c.categories_id = c.categories_id and c.parent_id = '4' and p.products_status = '1' order by p.products_date_added DESC limit 9]