Getting parent-child data from a single column in a table

Question

Hi,
I have a parent-child data in a column.
Eg:
0
00
01
010
011
1
10
11
These values are present in the single column itself. My need is to get the parent values for the given child value.
For eg: If I am giving the input as 011, the query should return all its parents, i.e. 01 and 0
Could you please give me any inputs on this?
Thanks,
GV

Answer 1

Frank Kulash wrote:
Assuming that each child's id is formed by adding exactly one character to the end of its parent's id:
SELECT     id
FROM     table_x
START WITH     id          = :target_id
CONNECT BY     PRIOR id     LIKE id || '_';
Small tweak to yours Frank if it's just the parents that need identifying...
SQL> ed
Wrote file afiedt.buf
  1  with t as (select '0' as x from dual union all
  2             select '00' from dual union all
  3             select '01' from dual union all
  4             select '010' from dual union all
  5             select '011' from dual union all
  6             select '1' from dual union all
  7             select '10' from dual union all
  8             select '11' from dual)
  9  -- end of test data
10  SELECT     x
11  FROM       t, (select '&required' as req from dual) req
12  WHERE x != req.req
13  START WITH x = req.req
14* CONNECT BY PRIOR x LIKE x || '_'
SQL> /
Enter value for required: 011
old  11: FROM   t, (select '&required' as req from dual) req
new  11: FROM   t, (select '011' as req from dual) req
X
01
0
SQL> /
Enter value for required: 11
old  11: FROM   t, (select '&required' as req from dual) req
new  11: FROM   t, (select '11' as req from dual) req
X
1
SQL>