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I have a hierarchical table named Employee_Hierarchy in oracle with column names entity_code, parent_entity_code, entity_name and entity_role with no cycle. Having lower most child in other table named Client connected with hierarchical table's lower most child with entity_code. I have to display the data in single row hierarchy where column name will be appended by role.
Sample Example:
Tree Structure:
Hierarchical Table:
Lower Most Child's Table:
Expected Result:
Is there a way to get the expected result through oracle query? And the expected result depends on input that means it will not always start from root element, it may start from any node for example team-lead (Shail) to lowermost child.
(Note:If a upper hierachy is missing then the parent_code of the current node will be its upper hierarchy's parent_code And the missing hierarchy element will be blank in expected result.)
Thanks in Advance.
321
SYS_CONNECT_BY_PATH is valid only in hierarchical queries. It returns the path of a column value from root to node, with column values separated by char for each row returned by CONNECT BY condition. Both column and char can be any of the datatypes CHAR , VARCHAR2 , NCHAR , or NVARCHAR2 .
The plus sign is Oracle syntax for an outer join. There isn't a minus operator for joins. An outer join means return all rows from one table. Also return the rows from the outer joined where there's a match on the join key. If there's no matching row, return null.
For a list of tables in the current schema, use the Show Tables command. For a list of views in the current schema, use the Show Views command. For a list of available schemas, use the Show Schemas command. If the table or view is in a particular schema, qualify it with the schema name.
The CONCAT function allows you to concatenate two strings together. To CONCAT more than two values, we can nest multiple CONCAT function calls. Parameters Used: string1: It is used to specify the first string to concatenate.
select h.Manager_entity_code
,h.Manager_entity_name
,h.Team_Lead_entity_code
,h.Team_Lead_entity_name
,h.Developer_entity_code
,h.Developer_entity_name
,c.client_name
from (select trim (both ',' from sys_connect_by_path (case when entity_role = 'Manager' then entity_code end,',')) as Manager_entity_code
,trim (both ',' from sys_connect_by_path (case when entity_role = 'Manager' then entity_name end,',')) as Manager_entity_name
,trim (both ',' from sys_connect_by_path (case when entity_role = 'Team-Lead' then entity_code end,',')) as Team_Lead_entity_code
,trim (both ',' from sys_connect_by_path (case when entity_role = 'Team-Lead' then entity_name end,',')) as Team_Lead_entity_name
,trim (both ',' from sys_connect_by_path (case when entity_role = 'Developer' then entity_code end,',')) as Developer_entity_code
,trim (both ',' from sys_connect_by_path (case when entity_role = 'Developer' then entity_name end,',')) as Developer_entity_name
from hierarchical_table
where connect_by_isleaf = 1
connect by parent_entity_code = prior entity_code
start with entity_code = 100
) h
join client_table c
on c.entity_code =
h.Developer_entity_code
order by h.Manager_entity_code
,h.Team_Lead_entity_code
,h.Developer_entity_code
;
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
| MANAGER_ENTITY_CODE | MANAGER_ENTITY_NAME | TEAM_LEAD_ENTITY_CODE | TEAM_LEAD_ENTITY_NAME | DEVELOPER_ENTITY_CODE | DEVELOPER_ENTITY_NAME | CLIENT_NAME |
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
| 100 | Mack | 200 | Shail | 500 | Neha | Tata |
| 100 | Mack | 300 | Jack | 600 | Rocky | Rel |
| 100 | Mack | 300 | Jack | 600 | Rocky | Voda |
| 100 | Mack | 300 | Jack | 600 | Rocky | Airtel |
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
For start with entity_code = 300
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
| MANAGER_ENTITY_CODE | MANAGER_ENTITY_NAME | TEAM_LEAD_ENTITY_CODE | TEAM_LEAD_ENTITY_NAME | DEVELOPER_ENTITY_CODE | DEVELOPER_ENTITY_NAME | CLIENT_NAME |
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
| (null) | (null) | 300 | Jack | 600 | Rocky | Airtel |
| (null) | (null) | 300 | Jack | 600 | Rocky | Voda |
| (null) | (null) | 300 | Jack | 600 | Rocky | Rel |
+---------------------+---------------------+-----------------------+-----------------------+-----------------------+-----------------------+-------------+
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