Heirarchial queries

Question

hi,
create table tree(child int, parent int)
How to find the grand parent of the child given
the child.
1,2
2,3
2,4
3,5
5,6
Now given 6 how can i find that its grand parent is 1.
thanks
Pramod
null

Answer 1

Try the following function:
CREATE OR REPLACE FUNCTION f_get_parent_id(PIN_CHILD NUMBER) RETURN NUMBER
IS
id NUMBER(10);
CURSOR c_id
IS
SELECT parent
FROM tree
CONNECT BY PRIOR parent = child
START WITH child = pin_child;
BEGIN
FOR c1rec in c_id
LOOP
id:= c1rec.parent;
END LOOP;
RETURN id;
END f_get_parent_id;
Test the above function from SQLPLUS:
SQL> select f_get_parent_id(6)
from dual;
F_GET_PARENT_ID(6)
1
null