Need Hierarchial Query

Question

Hi All,
I have below tables,
Tables
1 Employees Type (Tells About Employees Designation)
2.Employee Details (Tells Employee Details)
3.Employee Relation (Tells Relationship between Employees)
Hierarchy
ARC (SENIOR MANAGER)
SUN (MANAGER)
MOON (TECH LEAD)
LITE (EMPLOYEE)
RAG (TECH LEAD)
BESH (TECH LEAD)
CHESH (EMPLOYEE)
PRASAD (EMPLOYEE)
1 Employees Type Data
Type No||Type Name
1|Employee
2|Tech Lead
3|Manager
4|Senior Manager
2.Employee Details
Emp No||Emp Name|Employee Type
10|ARC|4
20|SUN|3
30|RAG|2
40|PRASAD|1
50|MOON|2
60|LITE|1
70|CHESH|1
80|BESH|2
3. Employee Relation
Relation Number|Emp No|Prnt_Relation Number
1|10|NULL
2|20|1
3|30|1
4|40|1
5|50|2
6|60|2
7|70|3
8|80|3
These are my tables structure,
Now I want Hierarchial Query for below,
Input will be Relation Number,
if I give relation number as input I want to display all immediate childern that are Tech Leads and Employees only (it should ignore if it is having any Managers in the result set)
Ex: -
Input is relation number from Employee Relation Table,
If I give input as *1*
Output Should be,
Relation Number|Employee_id|Employee Name
3|30|Rag
7|70|Besh
8|80|Chesh
If I give input as *2*
Output Should be,
Relation Number|Employee_id|Employee Name
5|50|MOON
6|60|LITE,
If I give input as *4*
Output Should be,
Relation Number|Employee_id|Employee Name
<NO Rows Returned>
Thanks,

Answer 1

Hi,
with emp_type as (  select 1 type_id, 'Employee' emp_type from dual
union
                    select 2 type_id, 'Tech Lead' emp_type from dual
union
                    select 3 type_id, 'Manager' emp_type from dual
union
                    select 4 type_id, 'Senior Manager' emp_type from dual),
emp_details as (   select 10 emp_no, 'ARC' fname, 4 type1 from dual
union
                        select 20 emp_no, 'SUN' fname, 3 type1 from dual
union
                        select 30 emp_no, 'RAG' fname, 2 type1 from dual
union
                        select 40 emp_no, 'PRASAD' fname, 1 type1 from dual
union
                        select 50 emp_no, 'MOON' fname, 2 type1 from dual
union
                        select 60 emp_no, 'LITE' fname, 1 type1 from dual
union
                        select 70 emp_no, 'CHESH' fname, 1 type1 from dual
union
                        select 80 emp_no, 'BESH' fname, 2 type1 from dual),
Emp_Relation as (
select 1 Relation, 10 emp_no1, null parent_Relation from dual
union
select 2 Relation, 20 emp_no1, 1 parent_Relation from dual
union
select 3 Relation, 30 emp_no1, 1 parent_Relation from dual
union
select 4 Relation, 40 emp_no1, 1 parent_Relation from dual
union
select 5 Relation, 50 emp_no1, 2 parent_Relation from dual
union
select 6 Relation, 60 emp_no1, 2 parent_Relation from dual
union
select 7 Relation, 70 emp_no1, 3 parent_Relation from dual
union
select 8 Relation, 80 emp_no1, 8 parent_Relation from dual)
select  type_id, emp_type,
        emp_no, fname, relation, parent_relation
from    EMP_DETAILS, EMP_TYPE, EMP_RELATION
WHERE   TYPE_ID = type1
AND     EMP_NO  = EMP_NO1
AND     LEVEL = 2
CONNECT BY PRIOR RELATION = PARENT_RELATION
START WITH RELATION = :P_RELATION
--START WITH PARENT_RELATION IS NULL -- If want to display the complete heirarchy remove comments for this line and remove "and level = 2" and  "START WITH RELATION = :P_RELATION"For p_relation = 1
   TYPE_ID EMP_TYPE           EMP_NO FNAME    RELATION PARENT_RELATION
         3 Manager                20 SUN             2               1
         2 Tech Lead              30 RAG             3               1
         1 Employee               40 PRASAD          4               1
3 rows selected.Not sure how do you get the following and it's not clear on what basis.
If I give input as *1*
Output Should be,
Relation Number|Employee_id|Employee Name
3|30|Rag
7|70|Besh
8|80|CheshFor p_relation = 2
   TYPE_ID EMP_TYPE           EMP_NO FNAME    RELATION PARENT_RELATION
         2 Tech Lead              50 MOON            5               2
         1 Employee               60 LITE            6               2
2 rows selected.For p_relation = 3
   TYPE_ID EMP_TYPE           EMP_NO FNAME    RELATION PARENT_RELATION
         1 Employee               70 CHESH           7               3
1 row selected.For p_relation = 4
no rows selected.Hope this helps
Best Regards
Arif Khadas
Edited by: Arif Khadas on Jun 29, 2010 12:47 PM