Parent_Child relationship.

Question

Oracle version ::
10G Express edition on windows Xp
Let Z specifies Zone;
Let D specifies Dept;
Let E specifies Emp;
Relation will be ::
Zone can have many dept
Dept can have many emp;
CREATE TABLE z ( Z1 number primary key ) ;
CREATE TABLE d ( D1 number primary key , d2 number references z(z1) ) ;
CREATE TABLE e ( e1 number primary key , e2 number references d(d1) ) ;
Insert into z values (1);
Insert into d values (10,1);
Insert into e values (100,10);I want the relation to formated in this way::
When i give input table_name as 'E'
PTBL     PCOL     PPKEY          CTBL     CCOL     CFKEY     
D     D1     SYS_C0017393     E     E2     SYS_C0017396     
Z     Z1     SYS_C0017392     D     D2     SYS_C0017394     Where
first record represents  E(e2) is child for d(d1)
second record represents D(d2) is child for z(z1)sys_* are nothing but the constraint name;
My Approach
   SELECT cc.table_name ptbl, cc.column_name pcol, cc.CONSTRAINT_NAME PPkey,
                c.table_name ctbl, cc1.column_name , c.CONSTRAINT_NAME FROM user_constraints c,
                user_cons_columns cc , user_cons_columns cc1 WHERE c.r_constraint_name = cc.constraint_name
                AND c.CONSTRAINT_NAME = cc1.CONSTRAINT_NAME
                AND c.table_name = 'E'
Problem:
With the query i prepared I am able to get the first Parent of E (that is D) but i want it should 'loop' once more since D also have a parent (Z)
Pls guide me if there is a better approach.
Hope i am clear with my requirement;
Thanks in Advance;

Answer 1

Try this. It's a slightly (hopefully correctly!) modified version of a Tom Kyte query I found a while ago. At the prompt, supply the name of the parent table you wish to find dependencies for. The original Tom Kyte query was at [this URL.|http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1236600128433]
select
child_tname, child_cons_name,
child_columns "foreign_key" , parent_tname "prntTable", parent_columns "prntCol"
from
( select a.table_name child_tname, a.constraint_name child_cons_name,
         b.r_constraint_name parent_cons_name,
         max(decode(position, 1,     '"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 2,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 3,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 4,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 5,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 6,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 7,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 8,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 9,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,10,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,11,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,12,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,13,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,14,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,15,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,16,', '||'"'||
                substr(column_name,1,30)||'"',NULL))
            child_columns
    from user_cons_columns a, user_constraints b
   where a.constraint_name = b.constraint_name
     and b.constraint_type = 'R'
   group by a.table_name, a.constraint_name, b.r_constraint_name ) child,
( select a.constraint_name parent_cons_name, a.table_name parent_tname,
         max(decode(position, 1,     '"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 2,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 3,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 4,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 5,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 6,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 7,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 8,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position, 9,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,10,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,11,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,12,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,13,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,14,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,15,', '||'"'||
                substr(column_name,1,30)||'"',NULL)) ||
         max(decode(position,16,', '||'"'||
                substr(column_name,1,30)||'"',NULL))
            parent_columns
    from user_cons_columns a, user_constraints b
   where a.constraint_name = b.constraint_name
     and b.constraint_type in ( 'P', 'U' )
   group by a.table_name, a.constraint_name ) parent
where child.parent_cons_name = parent.parent_cons_name
  and parent.parent_tname = upper('&1')