Hierarchy Query in Oracle

Question

I have the data like below
SQ     CHILD_PROD_KEY     PAR_PROD_KEY
101     39067     -1
101     39077     39067
101     39010     39077
101     39075     39067
101     39009     39075
102     39067     -1
102     39077     39067
102     39010     39077
102     39075     39067
I want to get level within each sq like below
SQ     CHILD_PROD_KEY     PAR_PROD_KEY     Level
101     39067     -1     1
101     39077     39067     2
101     39010     39077     3
101     39075     39067     2
101     39009     39075     3
102     39067     -1     1
102     39077     39067     2
102     39010     39077     3
102     39075     39067     2
I tryied to use
START WITH ab.par =-1
CONNECT BY PRIOR ab.child = ab.par
but its not working for each group, Let me know how to get it.

Answer 1

Hi,
as you mentioned nothing about the groups in the query it will show every path available, not just in the group to which the start node belongs. So just add this information about the SQ:
with testdata (SQ, CHILD_PROD_KEY, PAR_PROD_KEY ) as (
select 101,  39067, -1 from dual union all
select 101, 39077, 39067 from dual union all
select 101, 39010, 39077 from dual union all
select 101, 39075, 39067 from dual union all
select 101, 39009, 39075 from dual union all
select 102, 39067, -1 from dual union all
select 102, 39077, 39067 from dual union all
select 102, 39010, 39077 from dual union all
select 102, 39075, 39067  from dual
select SQ, CHILD_PROD_KEY, PAR_PROD_KEY, level from testdata
START WITH PAR_PROD_KEY =-1
CONNECT BY PRIOR CHILD_PROD_KEY = PAR_PROD_KEY
and prior sq=sq
SQ     CHILD_PROD_KEY     PAR_PROD_KEY     LEVEL
101     39067     -1     1
101     39075     39067     2
101     39009     39075     3
101     39077     39067     2
101     39010     39077     3
102     39067     -1     1
102     39075     39067     2
102     39077     39067     2
102     39010     39077     3regards