Creating Heirarchy problem

Question

Hi,
I have a table 'ABC' like this
parent child
3     30
3     31
3     32
3     33
30     300
30     302
31     312
31     313
30     301
32     32
iam creating hierarchy path from this table using the following query
select parent,child,sys_connect_by_path(child,'/') || '/' path
from ABC
start with parent='3'
connect by prior parent=child
iam getting the following error
SQL Error: ORA-01436: CONNECT BY loop in user data
01436. 00000 - "CONNECT BY loop in user data"
this is beacuse parant and child was same(32,32)
how to solve the problem
can any one help me?
Edited by: Balaji.tk on Jul 2, 2009 3:16 AM

Answer 1

Balaji.tk wrote:
Y not ?
iam taking the parent and child as numbers
if i take names
there is chance that employee and manager have same name
at that time how u will solve?So what you're saying is that one of the 32's is a different 32 to the other 32?
In that case the problem is with your design.
If we take your example of names, an employee and a manager may have the same name, but they would also have a unique primary key and the hierarchy would be created based on the parent-child relationship of those keys, not their names.