Ошибка при выполнении запроса
SELECT COUNT(*) FROM (
	SELECT
		u.original_file_id
	FROM
		torrents t
		JOIN torrent_covers tc ON t.cover_id=tc.id
		JOIN urls u ON tc.url_id=u.id
	WHERE
		t.deleted=0 AND u.host_id IS NULL AND u.original_file_id IS NOT NULL
	GROUP BY
		u.original_file_id
	HAVING COUNT(DISTINCT u.id) > 1
) t