Missing Parent

Question

Hi,
I'm trying to get missing parent in indentation order. I'm having problem in the logic. Could somebody show some light. Here the data and query.
for the fourth row before 3 i have needed to get 1 and 2 . But for that my query is not working. Please help me out.
create table hrch_test (HrchyId number(4), Role varchar2(20),Name varchar2(20),Hrchyid_sq number(4));
insert into hrch_test  
select 1 HrchyId,'Manager'    Role, 'Scott' Name, 1 Hrchyid_sq from dual    union all
select 2 HrchyId,'Supervisor' Role, 'Mary'  Name, 2 Hrchyid_sq from dual    union all  
select 3 HrchyId,'Clerk'      Role, 'Henry' Name, 3 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Tyson' Name, 4 Hrchyid_sq from dual    union all 
select 1 HrchyId,'Manager'    Role, 'Lee'   Name, 5 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Murry' Name, 6 Hrchyid_sq from dual    union all 
select 1 HrchyId,'Manager'    Role, 'Kirk'  Name, 7 Hrchyid_sq from dual    union all
select 4 HrchyId,'Jr Clerk'   Role, 'Tony'  Name, 8 Hrchyid_sq from dual;
select HRCHYID_SQ,role,name, Hrchyid
from hrch_test 
model 
partition by(Hrchyid_sq ) 
dimension by( Hrchyid rn) 
measures(role,name,HrchyId, lead(Hrchyid)over(order by Hrchyid_sq ) nxt) 
(role[for rn from HrchyId[1]+1 to nxt[1]-HrchyId[1] increment 1]= case when cv(rn)=2 then 'No s
upervisor'  
when cv(rn)=3 then 'No Clerk'  end,
HrchyId[rn]=cv(rn)  )
order by Hrchyid_sq
HRCHYID_SQ     ROLE     NAME     HRCHYID
1     Manager          Scott     1
2     Supervisor     Mary     2
3     Clerk          Henry     3
4     Clerk          Tyson     3
5     Manager          Lee     1
5     "No supervisor"          2
6     Clerk          Murry     3
7     Manager          Kirk     1
7     "No supervisor"          2
7     No Clerk          3
8     Jr Clerk     Tony     4Thanks,
Ramana.

Answer 1

I used this sample data:
insert into hrch_test  
select 1 HrchyId,'Manager'    Role, 'Scott' Name, 1 Hrchyid_sq from dual    union all
select 2 HrchyId,'Supervisor' Role, 'Mary'  Name, 2 Hrchyid_sq from dual    union all  
select 3 HrchyId,'Clerk'      Role, 'Henry' Name, 3 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Tyson' Name, 4 Hrchyid_sq from dual    union all 
select 1 HrchyId,'Manager'    Role, 'Lee'   Name, 5 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Murry' Name, 6 Hrchyid_sq from dual    union all 
select 1 HrchyId,'Manager'    Role, 'Kirk'  Name, 7 Hrchyid_sq from dual    union all
select 4 HrchyId,'Jr Clerk'   Role, 'Tony'  Name, 8 Hrchyid_sq from dual    union all
select 1 HrchyId,'Manager'    Role, 'Alf'   Name, 9 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Dana'  Name, 10 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Chris' Name, 11 Hrchyid_sq from dual    union all
select 4 HrchyId,'Jr Clerk'   Role, 'Pam'   Name, 12 Hrchyid_sq from dual    union all
select 3 HrchyId,'Clerk'      Role, 'Jack'  Name, 13 Hrchyid_sq from dualand if I'm not misunderstanding the OP's requirements this thing should do it.
SELECT hrchyid,
       case when hrchyid = 1 and role is null then 'NO MANAGER'
            when hrchyid = 2 and role is null then 'NO SUPERVISOR'
            when hrchyid = 3 and role is null then 'NO CLERK'
       else role end as role,
       name,
       nvl(hrchyid_sq, r) AS hrchyid_sq,
       r root_sq,
       root_id
  FROM (WITH t AS (SELECT h.*,
                          CASE
                            WHEN lead(hrchyid) over(ORDER BY hrchyid_sq) > hrchyid THEN
                             lead(hrchyid) over(ORDER BY hrchyid_sq)
                            ELSE
                             NULL
                          END next_hrchyid,
                          CASE
                            WHEN lead(hrchyid) over(ORDER BY hrchyid_sq) > hrchyid THEN
                             lead(hrchyid_sq) over(ORDER BY hrchyid_sq)
                            ELSE
                             NULL
                          END next_hrchyid_sq
                     FROM hrch_test h)
         SELECT hrchyid, role, NAME, hrchyid_sq, connect_by_root hrchyid_sq root_sq, connect_by_root hrchyid root_id
           FROM t
          START WITH nvl2(next_hrchyid - hrchyid, NULL, 1) = 1
         CONNECT BY PRIOR (hrchyid_sq) - 1 = hrchyid_sq
                    AND PRIOR hrchyid = next_hrchyid)
model
partition by(root_sq as r)
dimension by(hrchyid rn)
measures(role,name,HrchyId,Hrchyid_sq,root_id,cast(null as varchar2(10)) as iter)
rules upsert iterate (100) until previous(iter[1]) = iter[1]
(role[for rn from 1 to root_id[iteration_number] increment 1]= role[cv(rn)],
iter[1] = root_id[iteration_number],
HrchyId[rn]=cv(rn))
order by root_sq, HrchyIdDisregard the last 2 columns.
   HRCHYID ROLE                 NAME                 HRCHYID_SQ    ROOT_SQ    ROOT_ID
         1 Manager              Scott                         1          3          3
         2 Supervisor           Mary                          2          3          3
         3 Clerk                Henry                         3          3          3
         1 NO MANAGER                                         4          4
         2 NO SUPERVISOR                                      4          4
         3 Clerk                Tyson                         4          4          3
         1 Manager              Lee                           5          6          3
         2 NO SUPERVISOR                                      6          6
         3 Clerk                Murry                         6          6          3
         1 Manager              Kirk                          7          8          4
         2 NO SUPERVISOR                                      8          8
         3 NO CLERK                                           8          8
         4 Jr Clerk             Tony                          8          8          4
         1 Manager              Alf                           9         10          3
         2 NO SUPERVISOR                                     10         10
         3 Clerk                Dana                         10         10          3
         1 NO MANAGER                                        12         12
         2 NO SUPERVISOR                                     12         12
         3 Clerk                Chris                        11         12          4
         4 Jr Clerk             Pam                          12         12          4
   HRCHYID ROLE                 NAME                 HRCHYID_SQ    ROOT_SQ    ROOT_ID
         1 NO MANAGER                                        13         13
         2 NO SUPERVISOR                                     13         13
         3 Clerk                Jack                         13         13          3
23 rows selected
SQL>