Grouped output required based on input group :No one???????

Question

Hi to all,
I want grouped output based on input group.
e.g
SQL> select * from test_data;
FIELD
a
b
c
d
e
a
e
c
d
e
10 rows selected.
SQL>
Now I want grouped output like this
When I give input set (a,b) then output should be :
a,b
a
c
c
d
d
e
e
e
When I give input set (a,e) then output should be :
a,e
a,e
b
c
c
d
d
e
I want a query regarding this , I know this is possible through Pl/SQL, but the requirement is through query.....
rgds,
Rup

Answer 1

I want grouped output based on input group.
I want a query regarding this
with
test_data as
( select substr(p, instr(p, ',', 1, level) + 1, instr(p, ',', 2, level) - instr(p, ',', 1, level) - 1) as field
    from (select ',' || 'a,b,c,d,e,a,e,c,d,e' || ',' as p from dual)
    connect by level <= length(p) - length(replace(p, ',')) - 1
input_set as
( select distinct substr(p, instr(p, ',', 1, level) + 1, instr(p, ',', 2, level) - instr(p, ',', 1, level) - 1) as field
    from (select ',' || 'a,d,e' || ',' as p from dual)
    connect by level <= length(p) - length(replace(p, ',')) - 1
group_count as
( select min(count(i.field)) as group_cnt
    from test_data t, input_set i
    where i.field(+) = t.field
    group by t.field
    having count(i.field) > 0
test_data2 as
( select field,
      row_number() over (partition by field order by null) as group_no1,
      row_number() over (                   order by null) as group_no2
    from test_data
input_set2 as
( select field, row_number() over (order by field) as item_no
    from input_set
select max(fields) as fields
  from
  ( select
        replace(sys_connect_by_path(decode(level, 1, group_no2), '-'), '-') as group_no,
        ltrim(sys_connect_by_path(t.field, ','), ',') as fields,
        level as lvl
      from test_data2 t, input_set2 i, group_count
      where i.field(+) = t.field
      start with group_no1 > group_cnt or item_no = 1 or item_no is null
      connect by prior group_no1 <= group_cnt and group_no1 = prior group_no1 and item_no = prior item_no + 1
  group by group_no
  order by max(lvl) desc, fields
FIELDS
a,d,e
a,d,e
b
c
c
e
6 rows selected.