1054 - Unknown column 'p.products_gift' in 'where clause'

select distinct pd.products_name, pd.products_short_description, pd.products_description, m.manufacturers_name from products p left join manufacturers m on p.manufacturers_id = m.manufacturers_id left join products_description pd on p.products_id = pd.products_id, categories c, products_to_categories p2c WHERE pd.language_id = '2' and c.categories_status=1 and p.products_gift != 1 and p.products_id = p2c.products_id and c.categories_id = p2c.categories_id and products_status = '1' and p.products_date_added > '2010.08.06' order by p.products_date_added DESC

[ECB SQL Error]