create table t1 (
pk int primary key,
a int,
b int
);
insert into t1 values
( 1 , 0, 10),
( 2 , 0, 10),
( 3 , 1, 10),
( 4 , 1, 10),
( 8 , 2, 10),
( 5 , 2, 20),
( 6 , 2, 20),
( 7 , 2, 20),
( 9 , 4, 20),
(10 , 4, 20);
select a,
percent_rank() over (order by a),
cume_dist() over (order by a)
from t1;
a	percent_rank() over (order by a)	cume_dist() over (order by a)
0	0.0000000000	0.2000000000
0	0.0000000000	0.2000000000
1	0.2222222222	0.4000000000
1	0.2222222222	0.4000000000
2	0.4444444444	0.8000000000
2	0.4444444444	0.8000000000
2	0.4444444444	0.8000000000
2	0.4444444444	0.8000000000
4	0.8888888889	1.0000000000
4	0.8888888889	1.0000000000
select pk,
percent_rank() over (order by pk),
cume_dist() over (order by pk)
from t1 order by pk;
pk	percent_rank() over (order by pk)	cume_dist() over (order by pk)
1	0.0000000000	0.1000000000
2	0.1111111111	0.2000000000
3	0.2222222222	0.3000000000
4	0.3333333333	0.4000000000
5	0.4444444444	0.5000000000
6	0.5555555556	0.6000000000
7	0.6666666667	0.7000000000
8	0.7777777778	0.8000000000
9	0.8888888889	0.9000000000
10	1.0000000000	1.0000000000
select a,
percent_rank() over (partition by a order by a),
cume_dist() over (partition by a order by a)
from t1;
a	percent_rank() over (partition by a order by a)	cume_dist() over (partition by a order by a)
0	0.0000000000	1.0000000000
0	0.0000000000	1.0000000000
1	0.0000000000	1.0000000000
1	0.0000000000	1.0000000000
2	0.0000000000	1.0000000000
2	0.0000000000	1.0000000000
2	0.0000000000	1.0000000000
2	0.0000000000	1.0000000000
4	0.0000000000	1.0000000000
4	0.0000000000	1.0000000000
drop table t1;