Find the grand parent of child node

Question

Hi gurus,
I have a table with the following structure
Supp_Num     Parent_Num      Inidicator
     1                  Null                    0
     2                    1                      1
     3                    2                      1
     4                  Null                    0
     5                     4                     1
For all the parent Nodes the indicator will have '0'
For all the child Nodes the indicator will have '1'.
I want to write a sQL code where i provide a child name and it traces back to its root parent . For eg if i provide the procedure with Supp_Num=3 it should traverse back to 1 and give 1 as output
Thanks in advance

Answer 1

9ba2a86d-5f7e-4e53-99ee-d675435c2efd wrote:
Thanks for the reply but i'm expecting Supp_Num =4 as well since its parent for Supp_num=5 . Also i want to write it in a Stored Proc form where i just provide the
Supp_num as input and i get the root parent node as output.
Thanks in advance
You wrote in your original post
I want to write a sQL code where i provide a child name and it traces back to its root parent . For eg if i provide the procedure with Supp_Num=3 it should traverse back to 1 and give 1 as output
And my solution did exactly the same. Now if you want the Root details for SUPP_NUM=5, it will provide the root node for same. See below:
with data as
  select 1 supp_num, null par_num, 0 ind from dual union all
  select 2 supp_num, 1 par_num, 1 ind from dual union all
  select 3 supp_num, 2 par_num, 1 ind from dual union all
  select 4 supp_num, null par_num, 0 ind from dual union all
  select 5 supp_num, 4 par_num, 1 ind from dual
select *
  from (
        select supp_num, par_num, ind
          from data
         start with supp_num = 5
        connect by supp_num = prior par_num
where par_num is null;
SUPP_NUM               PAR_NUM                IND                   
4                                             0
You just need to set the START WITH clause with appropriate SUPP_NUM.