SQL & PL/SQL

I'm using Oracle 10.2.0.4 version. I have a database table with the following structure,

CREATE TABLE SOME_TABLE
( 
  ID        NUMBER(10) PRIMARY KEY,
  PARENT    NUMBER(10)
)


ID    PARENT_ID

1        0 
2        1
3        1
4        2
5        4
6        4
100      0

Here '0' is root PARENT_ID. Say ID 5's parent is 4 & 4's parent is 2 & 2's parent is 1. How can i frame a SQL select query to which can eventually give me the output as '5/4/2/1' which is the parent hierarchy of ID 5. See the output doesn't contain the root PARENT_ID '0'

Edited by: Vel on Jan 5, 2012 12:20 AM