Using Oracle 11G (not R2) database, we need to create reports that show which Leadership Committe an individual's reporting structure belongs to.
At a high level, we determine an individual's presence on the board by locating the employee ID in table board_members.
The board_members table has a position ID that can be used to access board_positions, and from there we can determine if the position is on the leadership committee. (Samples below.)
For any employee who is on the leadership committee, his own ID will represent BOARD_LEAD.
For any other employee, the report_to value is recursed until a Leadership Committee member is identified, and that person's ID will be BOARD_LEAD.
Our top-level staff have report_to equal their own empl_id, rather than the more-common NULL.
To hopefully demonstrate this, I have set up sample tables, sample data, and sample desired output below.
I am trying to understand how to create a VIEW that will provide such information for Full Time Equivalence and other reporting needs. I am convinced that CONNECT BY will be involved, but I find the Oracle documentation confusing and I have found no examples that include multiple tables such as this. (I fear there is good reason for this lack of example.)
Is it even possible to write such a view at Oracle 11g (not R2) rather than an intermediate table that must be updated with each position change?
Create table board_positions /* If board_position = 'LDRSHPCOMM' this is a top position */
(member_id varchar(6),board_position varchar(18));
Create table board_members
(empl_id varchar(6), member_id varchar(6));
Create table emp
(empl_id varchar(6),ename varchar(32),report_to varchar(6));
Insert into board_positions values('CEO','LDRSHPCOMM');
Insert into board_positions Values('COO','LDRSHPCOMM');
Insert into board_positions Values('CFO','LDRSHPCOMM');
Insert into board_positions Values('CIO','LDRSHPCOMM');
Insert into board_positions values('WANABE','NEWBIE');
Insert into emp ('TOPDOG','Big Guy','TOPDOG');
Insert into emp ('WALLET','Money Bags','TOPDOG');
Insert into emp ('OPSGUY','Meikut Work','TOPDOG');
Insert into emp ('INFGUY','Comp U Turk','TOPDOG');
Insert into emp ('HITECH','Number 2','INFGUY');
Insert into emp ('LOTECH','Number 3','HITECH');
Insert into emp ('PROGMR','Nameless Blameless','LOTECH');
insert into emp ('FLUNKY','Ida Dunnit','PROGMR');
Insert into board_members ('TOPDOG','CEO');
Insert into board_members ('WALLET','CFO');
Insert into board_members ('OPSGUY','COO');
Insert into board_members ('INFGUY','CIO');
Insert into board_members ('HITECH','WANABE'); /* Board position not on the leadership committee */
Using something like:
CREATE VIEW LEADER_VIEW AS
WITH T1 AS (SELECT e.empl_id, (something) as board_lead
, (something) as board_lead_pos
FROM emp e
LEFT OUTER JOIN board_members bm
ON bm.empl_id = e.empl_id
LEFT OUTER JOIN board_positions bp
on bp.member_id = bm.member_id
...
CONNECT BY PRIOR empl_id = report_to
START WITH empl_id = report_to
)
SELECT * FROM T1
(But I know there's much more to it than this!)
Desired output example . . .
TOPDOG TOPDOG CEO (Because self is on LDRSHPCOMM)
WALLET WALLET CFO (Because self is on LDRSHPCOMM)
OPSGUY OPSGUY COO (Because self is on LDRSHPCOMM)
INFGUY INFGUY CIO (Because self is on LDRSHPCOMM)
HITECH INFGUY CIO (Because REPORTTO is on LDRSHPCOMM)
LOTECH INFGUY CIO (Because REPORTTO->REPORTTO is on LDRSHPCOMM)
PROGMR INFGUY CIO (REPORTTO->REPORTTO->REPORTTO is on LDRSHPCOMM)
FLUNKY INFGUY CIO (You know by now.)
You could do something like this:
SQL> SELECT *
2 FROM (SELECT empl_id, ename, report_to,
3 member_id, board_position,
4 MAX(lvl) over(PARTITION BY empl_id) maxlvl, lvl
5 FROM (SELECT connect_by_root(e.empl_id) empl_id,
6 connect_by_root(e.ename) ename,
7 bm.empl_id report_to,
8 LEVEL lvl, bp.*
9 FROM emp e
10 LEFT JOIN board_members bm
11 ON e.empl_id = bm.empl_id
12 LEFT JOIN board_positions bp
13 ON bm.member_id = bp.member_id
14 CONNECT BY NOCYCLE e.empl_id = PRIOR e.report_to
15 AND (PRIOR bp.board_position IS NULL
16 OR PRIOR bp.board_position != 'LDRSHPCOMM')))
17 WHERE lvl = maxlvl;
EMPL_ID ENAME REPORT_TO MEMBER_ID BOARD_POSITION
------- -------------------------------- --------- --------- ------------------
FLUNKY Ida Dunnit INFGUY CIO LDRSHPCOMM
HITECH Number 2 INFGUY CIO LDRSHPCOMM
INFGUY Comp U Turk INFGUY CIO LDRSHPCOMM
LOTECH Number 3 INFGUY CIO LDRSHPCOMM
OPSGUY Meikut Work OPSGUY COO LDRSHPCOMM
PROGMR Nameless Blameless INFGUY CIO LDRSHPCOMM
TOPDOG Big Guy TOPDOG CEO LDRSHPCOMM
WALLET Money Bags WALLET CFO LDRSHPCOMM
I have no START WITH clause because I want to start the hierarchical query for all employees. For each employee I walk through the hierarchical data until I find a manager that is a board member on the leadership committee (CONNECT BY clause).
The outer queries filter the relevant lines.
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