mariadb/mysql-test/main/win_percent_cume.test

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;

select pk,
       percent_rank() over (order by pk),
       cume_dist() over (order by pk)
from t1 order by pk;

select a,
        percent_rank() over (partition by a order by a),
        cume_dist() over (partition by a order by a)
from t1;

drop table t1;