(SELECT DISTINCT id, post_cat_relations.category_id, title, img_path, excerpt, DATE_FORMAT(date_time, '%d.%m.%y') AS date, date_time
                            FROM articles, post_cat_relations, categories
                                    WHERE post_cat_relations.category_id = $catid AND categories.parent_id = 0 AND visible = '1')
                            UNION
         (SELECT DISTINCT id, post_cat_relations.category_id, title, img_path, excerpt, DATE_FORMAT(date_time, '%d.%m.%y') AS date, date_time
           FROM articles, post_cat_relations, categories
           WHERE post_cat_relations.category_id IN
           (
           SELECT cat_id FROM categories WHERE parent_id=$catid
           ) AND post_cat_relations.article_id = articles.id AND visible = '1') ORDER BY date_time DESC