asc nulls last, asc
1	1
1	2
1	3
1	4
asc nulls first, asc
1	1
1	2
1	3
1	4
desc nulls last, asc
1	1
1	2
1	3
1	4
desc nulls first, asc
1	1
1	2
1	3
1	4
asc nulls last, desc
1	8
1	7
1	6
1	5
asc nulls first, desc
1	8
1	7
1	6
1	5
desc nulls last, desc
1	8
1	7
1	6
1	5
desc nulls first, desc
1	8
1	7
1	6
1	5