Array
(
    [tag_id] => 255
    [videos_count] => 16
    [name] => дилдо
)



SELECT COUNT(*) FROM videos_categories c INNER JOIN videos_tags t1 ON t1.video_id=c.video_id AND t1.tag_id=255 INNER JOIN videos_tags t2 ON t2.video_id=c.video_id AND t2.tag_id=20 WHERE c.category_id=?