Hierarchy Query For Full Tree ?

Question

Hi Everyone,
I want to write a hierarchy query which should give me the whole path starting from root node to each individual nodes by passing value of any individual tree member. below is the sample data and the output what i am expecting. and also the output what i am getting right now from my query.
CREATE TABLE RELATION (PARENT VARCHAR2(1),CHILD VARCHAR2(1) PRIMARY KEY);
--Data for the tree which starts from the root 'A'
Insert into RELATION (PARENT, CHILD) Values (NULL,'A');
Insert into RELATION (PARENT, CHILD) Values ('A', 'B');
Insert into RELATION (PARENT, CHILD) Values ('A', 'C');
Insert into RELATION (PARENT, CHILD) Values ('B', 'D');
Insert into RELATION (PARENT, CHILD) Values ('B', 'E');
Insert into RELATION (PARENT, CHILD) Values ('D', 'F');
Insert into RELATION (PARENT, CHILD) Values ('C', 'G');
--Data for the tree which starts from the root 'H'
Insert into RELATION (PARENT, CHILD) Values (NULL,'H');
Insert into RELATION (PARENT, CHILD) Values ('H', 'I');
Insert into RELATION (PARENT, CHILD) Values ('H', 'J');
Expected Output by passing values as 'C' which gives the whole tree where the node C is present:
A
A->B
A->C
A->B->D
A->B->E
A->C->G
A->B->D->F
My Query:
select
sys_connect_by_path(child,'->') tree
from
relation
--where (parent ='C' or child='C') 
start with
parent is null
connect by
prior child = parent
order by tree;
Output of my query:
->A
->A->B
->A->B->D
->A->B->D->F
->A->B->E
->A->C
->A->C->G
->H
->H->I
->H->J
I am not able to add the condition for the query so that i can get only rows of the tree where the nod 'C' is present. i am just getting whole data from the table with all the unwanted trees.
Can anyone please help me in getting the correct output.
Thank you in advance.

Answer 1

odie_63 wrote:
Another solution, involving analytics : Hierarchical queries and analytic functions do not mix well together in 10g:
SQL> select * from v$version
  2  /
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for 32-bit Windows: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> SELECT tree
  2  FROM (
  3    select sys_connect_by_path(child,'->') tree,
  4           max(case when child = 'C' then connect_by_root(child) end) over() root1,
  5           connect_by_root(child) root2
  6    from relation
  7    start with parent is null
  8    connect by prior child = parent
  9  )
10  WHERE root1 = root2
11  ;
  from relation
ERROR at line 6:
ORA-00600: internal error code, arguments: [qctcte1], [0], [], [], [], [], [], []
SQL> Although it is much better in 11g:
SQL> select * from v$version
  2  /
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> SELECT tree
  2  FROM (
  3    select sys_connect_by_path(child,'->') tree,
  4           max(case when child = 'C' then connect_by_root(child) end) over() root1,
  5           connect_by_root(child) root2
  6    from relation
  7    start with parent is null
  8    connect by prior child = parent
  9  )
10  WHERE root1 = root2
11  ;
TREE
->A
->A->B
->A->B->D
->A->B->D->F
->A->B->E
->A->C
->A->C->G
7 rows selected.
SQL> SY.