Grouping of numbers

Question

I have data in my table as follows:
ID BONUS
N123 0.005
N123 0.006
N123 0.004
N383 0.004
N383 0.007
N091 0.007
N091 0.008
N091 0.009
I am trying to re-sequence the second field to start with 0.001 for each group of ID(exactly based on the positioning of the decimal number)
In other words, I would like my output to be
N123 0.002
N123 0.003
N123 0.001
N383 0.001
N383 0.002
N091 0.001
N091 0.002
N091 0.003
How can this be done? Thanks

Answer 1

SQL> create table t(ID varchar2(5), BONUS number(5, 3))
  2  /
Table created.
SQL> insert into t values ('N123', 0.005) ;
1 row created.
SQL> insert into t values ('N123', 0.006) ;
1 row created.
SQL> insert into t values ('N123', 0.004) ;
1 row created.
SQL> insert into t values ('N383', 0.004) ;
1 row created.
SQL> insert into t values ('N383', 0.007) ;
1 row created.
SQL> insert into t values ('N091', 0.007) ;
1 row created.
SQL> insert into t values ('N091', 0.008) ;
1 row created.
SQL> insert into t values ('N091', 0.009) ;
1 row created.
SQL> select id, 0.001 * row_number() over (partition by id order by id, bonus) bonus from t ;
ID         BONUS
N091        .001
N091        .002
N091        .003
N123        .001
N123        .002
N123        .003
N383        .001
N383        .002
8 rows selected.
SQL>