How to insert a new rows for missing rows

Question

Hi,
I have data like below.Generally the heirarchy like Manager,Supervisor,clerk and Jr.clerk. But, some times clerk directly reports to Manager that time i need to show "no supervisor" when retrive the data. Is there any way can we do that by using the sql query instead writing the procedure or function.
The heirarchy is not only three levels. Just i have given a sample data.
Current data :
HrchyId                   Role                 Name
======                ========               =======
1                    Manager                     Scott
2                    Supervisor                 Mary
3                    Clerk                     Henry
3                    Clerk                     Tyson
1                    Manager                     Lee
3                    Clerk                     Murry
1                             Manager                      Kirk
4                             Jr Clerk                        Tony
Output:
HrchyId                   Role                 Name
======                ========               =======
1                    Manager                     Scott
2                    Supervisor                 Mary
3                    Clerk                     Henry
3                    Clerk                     Tyson
1                    Manager                     Lee
2                             No Supervisor               Null
3                    Clerk                     Murry
1                             Manager                      Kirk
2                             No Supervisor               Null
3                             No clerk                      Null
4                             Jr Clerk                        TonyAppreciated your help.
Thanks & Regards,
RM.

Answer 1

Something like this?
with x_roles
as   (           select 'Manager'    Role, 1 HrchyId from dual
       union all select 'Supervisor' Role, 2 HrchyId from dual
       union all select 'Clerk'      Role, 3 HrchyId from dual
       union all select 'Jr Clerk'   Role, 4 HrchyId from dual
,    x_employees
as   (           select 'Manager'    Role, 'Scott' Name, 1 Hrchyid_sq from dual
       union all select 'Supervisor' Role, 'Mary'  Name, 2 Hrchyid_sq from dual
       union all select 'Clerk'      Role, 'Henry' Name, 3 Hrchyid_sq from dual
       union all select 'Clerk'      Role, 'Tyson' Name, 4 Hrchyid_sq from dual
       union all select 'Manager'    Role, 'Lee'   Name, 5 Hrchyid_sq from dual
       union all select 'Clerk'      Role, 'Murry' Name, 6 Hrchyid_sq from dual
       union all select 'Manager'    Role, 'Kirk'  Name, 7 Hrchyid_sq from dual
       union all select 'Jr Clerk'   Role, 'Tony'  Name, 8 Hrchyid_sq from dual
,     x_hierarchy
as    ( select r.HrchyId
        ,      e.Role
        ,      e.Name
        ,      e.Hrchyid_sq
        from   x_employees  e
        ,      x_roles      r
        where  1=1
        and    r.role = e.role
,     x_missing_hrchy
as    (
        select Hrchyid_sq
        ,      HrchyId
        ,      Name
        ,      MissingHrchy
        from   (
                 select h.Hrchyid_sq
                 ,      h.HrchyId
                 ,      h.Name
                 ,      h.HrchyId - lag( h.HrchyId ) over ( order by h.Hrchyid_sq ) - 1  MissingHrchy
                 from   x_hierarchy  h
        where  1=1
        and    MissingHrchy > 0
select m.HrchyId - g.HrchyGen   HrchyId
,      'No ' || r.Role          Role
,      'Null'                   Name
,      m.Hrchyid_sq             Hrchyid_sq
from   x_missing_hrchy      m
,      ( select level HrchyGen
         from   dual
         ,      ( select max( MissingHrchy ) MissingHrchy from x_missing_hrchy ) m
         connect by level <= m.MissingHrchy
       )                    g
,      x_roles              r
where  1=1
and    g.HrchyGen <= m.MissingHrchy
and    r.HrchyId  =  m.HrchyId - g.HrchyGen
union
select h.HrchyId
,      h.Role
,      h.Name
,      h.Hrchyid_sq
from   x_hierarchy h
order by 4
,        1
   HRCHYID ROLE          NAME  HRCHYID_SQ
         1 Manager       Scott          1
         2 Supervisor    Mary           2
         3 Clerk         Henry          3
         3 Clerk         Tyson          4
         1 Manager       Lee            5
         2 No Supervisor Null           6
         3 Clerk         Murry          6
         1 Manager       Kirk           7
         2 No Supervisor Null           8
         3 No Clerk      Null           8
         4 Jr Clerk      Tony           8I've used the queries x_roles, x_employees and x_hierarchy to generate the data you've provided.
Query x_missing_hrchy determines for each Hrchyid_sq how many managers are missing:
with ..
select *
from    x_missing_hrchy
HRCHYID_SQ    HRCHYID NAME  MISSINGHRCHY
         6          3 Murry            1
         8          4 Tony             2Murry misses one supervisor and Tony misses two supervisors.
For each missing supervisor I need to create a row. For that I use the connect by clause:
with ..
select m.Hrchyid_sq
,      m.HrchyId
,      m.Name
,      g.HrchyGen
,      m.HrchyId - g.HrchyGen MissingHrcyId
from   x_missing_hrchy      m
,      ( select level HrchyGen
         from   dual
         ,      ( select max( MissingHrchy ) MissingHrchy from x_missing_hrchy ) m
         connect by level <= m.MissingHrchy
       )                    g
where  1=1
and    g.HrchyGen <= m.MissingHrchy
order by m.Hrchyid_sq
,        5
HRCHYID_SQ    HRCHYID NAME    HRCHYGEN MISSINGHRCYID
         6          3 Murry          1             2
         8          4 Tony           2             2
         8          4 Tony           1             3After that you just select the name of the missing role and add the original hierarchy to the set to get the requested output:
with ..
select m.HrchyId - g.HrchyGen   HrchyId
,      'No ' || r.Role          Role
,      'Null'                   Name
,      m.Hrchyid_sq             Hrchyid_sq
from   x_missing_hrchy      m
,      ( select level HrchyGen
         from   dual
         ,      ( select max( MissingHrchy ) MissingHrchy from x_missing_hrchy ) m
         connect by level <= m.MissingHrchy
       )                    g
,      x_roles              r
where  1=1
and    g.HrchyGen <= m.MissingHrchy
and    r.HrchyId  =  m.HrchyId - g.HrchyGen
union
select h.HrchyId
,      h.Role
,      h.Name
,      h.Hrchyid_sq
from   x_hierarchy h
order by 4
,        1
   HRCHYID ROLE          NAME  HRCHYID_SQ
         1 Manager       Scott          1
         2 Supervisor    Mary           2
         3 Clerk         Henry          3
         3 Clerk         Tyson          4
         1 Manager       Lee            5
         2 No Supervisor Null           6
         3 Clerk         Murry          6
         1 Manager       Kirk           7
         2 No Supervisor Null           8
         3 No Clerk      Null           8
         4 Jr Clerk      Tony           8Cheers Danny