Heirarchy

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)
if we use connect by nocycle it is eliminating the last row
how to solve the problem
can any one help me?

Answer 1

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"What version of oracle are you using
I don't get error
SQL> r
  1  with data as (
  2  select 3 parent,30 child from dual union all
  3  select 3,  31 from dual union all
  4  select 3,  32 from dual union all
  5  select 3,  33 from dual union all
  6  select 30, 300 from dual union all
  7  select 30, 302 from dual union all
  8  select 31, 312 from dual union all
  9  select 31, 313 from dual union all
10  select 30, 301 from dual union all
11  select 32, 32 from dual
12  )
13  select parent, child , sys_connect_by_path ( child ,'/') xc
14  from data
15  start with parent = 3
16* connect by prior parent = child
    PARENT       CHILD XC
         3          30 /30
         3          31 /31
         3          32 /32
         3          33 /33You can use NOCYCLE key word if you get this error http://www.adp-gmbh.ch/ora/sql/connect_by_nocycle.html
SQL> r
  1  with data as (
  2  select 3 parent,30 child from dual union all
  3  select 3,  31 from dual union all
  4  select 3,  32 from dual union all
  5  select 3,  33 from dual union all
  6  select 30, 300 from dual union all
  7  select 30, 302 from dual union all
  8  select 31, 312 from dual union all
  9  select 31, 313 from dual union all
10  select 30, 301 from dual union all
11  select 32, 32 from dual
12  )
13  select parent, child , sys_connect_by_path ( child ,'/') xc
14  from data
15  start with parent = 3
16* connect by NOCYCLE prior parent = child
    PARENT       CHILD XC
         3          30 /30
         3          31 /31
         3          32 /32
         3          33 /33SS