select x.nr_line as Pierwsza, y.nr_line as druga from Course x, Course y,
(
	select top 1 A.course_id as startt, B.course_id as endd, A.stop_id, A._time as Atime, B._time as Btime, DATEDIFF(minute, A._time, B._time) as Diff from
	(select course_id, stop_id, _time from TimeTable where TimeTable.course_id in 
		(select course_id from TimeTable join Stops on TimeTable.stop_id = Stops.stop_id where Stops.stop_name = 'Arkadia') ) A 
		join 
	(select course_id, stop_id, _time from TimeTable where TimeTable.course_id in 
		(select course_id from TimeTable join Stops on TimeTable.stop_id = Stops.stop_id where Stops.stop_name = 'Sadyba') ) B
		on 
		A.stop_id = B.stop_id AND A.course_id != B.course_id 
	where
		A._time < B._time
	order by Diff
) z 
where 
x.course_id = z.startt AND y.course_id = z.endd