CONNECT BY - Start from different levels

Question

Hello again,
It's me again with a hierarchical query on which I'm stuck...
I think, the easiest way to understand my issue is to get an example:
DROP TABLE my_organisations;
CREATE TABLE my_organisations
  org_id NUMBER(10),
  org_name VARCHAR2(100),
  parent_org_id NUMBER(10),
  is_modified NUMBER(1)
INSERT INTO my_organisations VALUES(1, 'Top organisation', null, 0);
-- first department
INSERT INTO my_organisations VALUES(362, 'HR', 1, 0);
INSERT INTO my_organisations VALUES(11, 'Recruitment', 362, 0);
INSERT INTO my_organisations VALUES(119, 'Local Recruiment', 11, 1);
INSERT INTO my_organisations VALUES(192, 'Remote recruitment', 11, 0);
-- second department
INSERT INTO my_organisations VALUES(1000, 'SALES', 1, 0);
INSERT INTO my_organisations VALUES(1101, 'Local Sales', 1000, 0);
INSERT INTO my_organisations VALUES(1102, 'Remote Sales', 1000, 0);
INSERT INTO my_organisations VALUES(9452, 'Brazilian Sales', 1102, 1);
INSERT INTO my_organisations VALUES(9992, 'Mexican Sales', 1102, 1);
INSERT INTO my_organisations VALUES(9110, 'Japanese Sales', 1102, 0);
INSERT INTO my_organisations VALUES(1103, 'Lost', 11, 0);
-- thirst department
INSERT INTO my_organisations VALUES(333, 'IT', 1, 0);
INSERT INTO my_organisations VALUES(444, 'Helpdesk', 333, 0);
INSERT INTO my_organisations VALUES(555, 'Hardware', 444, 0);
INSERT INTO my_organisations VALUES(666, 'Software', 444, 0);
INSERT INTO my_organisations VALUES(777, 'Microsoft', 666, 0);
INSERT INTO my_organisations VALUES(778, 'Linux', 666, 0);
INSERT INTO my_organisations VALUES(788, 'MAC OS', 666, 0);
INSERT INTO my_organisations VALUES(888, 'Windows', 777, 0);
INSERT INTO my_organisations VALUES(999, 'XP', 888, 1);
INSERT INTO my_organisations VALUES(1111, 'MAC', 555, 0);
COMMIT;I have a hierarchical structure store in the my_organisations table. The parent child relation is made using parent_org_id. As you can see in my table definition, I have a flag is modified. That flag can be set at any level in the hierarchy.
I would like to have a statement that returns all the modified organisations with all their hierarchy (ascendants and descendants). Is this possible without having to write PL/SQL procedure?
I have no idea how to start. If I have a SELECT ... CONNECT BY... START WITH is_modified = 1, I only have the modified nodes and then I can get ascending nodes. But I have no idea how I can get the whole hierarchy of a node...
Can anyone help ?? (Im using 10g)
Thanks,

Answer 1

Hi,
Stew Ashton wrote:
Adding a few details to Frank's idea, just to get things sorted reasonably:To really get things sorted correctly, I think you'll have to do yet another CONNECT BY, on the result set of the UNION:
WITH     universe     AS
     SELECT     *          -- Get modified nodes and descendants 
     FROM     my_organisations
     START WITH     is_modified     = 1
     CONNECT BY     parent_org_id     = PRIOR org_id
             UNION
     SELECT     *          -- Get ancestors of modified nodes
     FROM     my_organisations
     START WITH     is_modified     = 1
     CONNECT BY     PRIOR parent_org_id     = org_id
SELECT     org_id
,     LPAD ( ' '
          , 2 * (LEVEL - 1)
          ) || org_name     AS org_name
,     parent_org_id
,     is_modified
,     LEVEL
FROM     universe
START WITH     parent_org_id     IS NULL
CONNECT BY     parent_org_id     = PRIOR org_id
;Output:
ORG_ID ORG_NAME                  PARENT_ORG_ID IS_MODIFIED LEVEL
     1 Top organisation                                  0     1
   333   IT                                  1           0     2
   444     Helpdesk                        333           0     3
   666       Software                      444           0     4
   777         Microsoft                   666           0     5
   888           Windows                   777           0     6
   999             XP                      888           1     7
   362   HR                                  1           0     2
    11     Recruitment                     362           0     3
   119       Local Recruiment               11           1     4
  1000   SALES                               1           0     2
  1102     Remote Sales                   1000           0     3
  9452       Brazilian Sales              1102           1     4
  9992       Mexican Sales                1102           1     4