When CONNECT_BY_ISLEAF can't do the job?

Question

Hi everyone,
I have an issue with CONNECT_BY_ISLEAF. I would like to add conditions on it. Can anyone help? I'm using Oracle 10g.
Let's take the following scenario:
DROP TABLE departments;
CREATE TABLE departments
  dpt_id NUMBER(10) UNIQUE,
  dpt_name VARCHAR2(100),
  dpt_parent_id NUMBER(10),
  is_valid NUMBER(1)
INSERT INTO departments VALUES(1, 'Company', null, 1);
INSERT INTO departments VALUES(2, 'HR', 1, 1);
INSERT INTO departments VALUES(3, 'SALES', 1, 1);
INSERT INTO departments VALUES(4, 'IT', 1, 1);
INSERT INTO departments VALUES(222, 'Helpdesk', 4, 1);
INSERT INTO departments VALUES(223, 'French Speaking', 222, 1);
INSERT INTO departments VALUES(224, 'Another level', 223, 0);
INSERT INTO departments VALUES(5, 'LEGAL', 1, 1);
INSERT INTO departments VALUES(66, 'Recruitment', 2, 1);
INSERT INTO departments VALUES(33, 'Logistics', 2, 1);
INSERT INTO departments VALUES(39, 'Fleet management', 33, 1);
INSERT INTO departments VALUES(31, 'Local Sales', 3, 1);
INSERT INTO departments VALUES(60, 'European Sales', 3, 1);
INSERT INTO departments VALUES(61, 'Germany', 60, 1);
INSERT INTO departments VALUES(62, 'France', 60, 1);
INSERT INTO departments VALUES(620, 'Paris', 62, 1);
INSERT INTO departments VALUES(621, 'Marseilles', 62, 1);
INSERT INTO departments VALUES(38, 'American Sales', 3, 1);
INSERT INTO departments VALUES(34, 'Asian Sales', 3, 1);
INSERT INTO departments VALUES(9999, 'VIP 01', 1, 1);
INSERT INTO departments VALUES(9998, 'Politicians', 9999, 1);
INSERT INTO departments VALUES(9997, 'Singers', 9999, 1);
INSERT INTO departments VALUES(9996, 'Korean Singers', 9997, 1);
INSERT INTO departments VALUES(6325, 'VIP 02', 1, 1);
INSERT INTO departments VALUES(6311, 'Steering Bord', 6325, 0);
INSERT INTO departments VALUES(6310, 'Another high level group', 6325, 0);
COMMIT;I have a departments table that is recursive. The link to a parent department is done through dpt_parent_id and root nodes have a null value in this attribute.
As you can see, I also have a flag identifying what node is valid or not. Invalid nodes should not be taken into considerations in the CONNECT_BY_ISLEAF operator. Can this be achieved?
The following statement:
SELECT dpt_id, dpt_name, is_valid, CONNECT_BY_ISLEAF, LPAD(' ', (LEVEL-1) * 2) || dpt_name as indented_name
   FROM departments
  START WITH dpt_parent_id IS NULL
CONNECT BY PRIOR dpt_id = dpt_parent_id;returns this result:
1     Company                    1     0     Company
2     HR                         1     0       HR
33     Logistics                    1     0         Logistics
39     Fleet management          1     1           Fleet management
66     Recruitment               1     1         Recruitment
3     SALES                    1     0       SALES
31     Local Sales                    1     1         Local Sales
34     Asian Sales                    1     1         Asian Sales
38     American Sales               1     1         American Sales
60     European Sales               1     0         European Sales
61     Germany                    1     1           Germany
62     France                    1     0           France
620     Paris                         1     1             Paris
621     Marseilles                    1     1             Marseilles
4     IT                         1     0       IT
222     Helpdesk                    1     0         Helpdesk
223     French Speaking               1     0           French Speaking
224     Another level               0     1             Another level               -- incorrect
5     LEGAL                    1     1       LEGAL
6325     VIP 02                    1     0       VIP 02
6310     Another high level group     0     1         Another high level group    -- incorrect
6311     Steering Bord               0     1         Steering Bord                   -- incorrect 
9999     VIP 01                    1     0       VIP 01
9997     Singers                    1     0         Singers
9996     Korean Singers               1     1           Korean Singers
9998     Politicians                    1     1         PoliticiansThe previous result is wrong. The three records marked incorrect don't have the right result. Because their parent nodes only have invalid children, they should be the leaf... So, instead, I should have something like:
1     Company                    1     0     Company
2     HR                         1     0       HR
33     Logistics                    1     0         Logistics
39     Fleet management          1     1           Fleet management
66     Recruitment               1     1         Recruitment
3     SALES                    1     0       SALES
31     Local Sales                    1     1         Local Sales
34     Asian Sales                    1     1         Asian Sales
38     American Sales               1     1         American Sales
60     European Sales               1     0         European Sales
61     Germany                    1     1           Germany
62     France                    1     0           France
620     Paris                         1     1             Paris
621     Marseilles                    1     1             Marseilles
4     IT                         1     0       IT
222     Helpdesk                    1     0         Helpdesk
223     French Speaking               1     1           French Speaking                -- correct now
224     Another level               0     0             Another level
5     LEGAL                    1     1       LEGAL
6325     VIP 02                    1     1       VIP 02                                 -- correct now !!
6310     Another high level group     0     0         Another high level group
6311     Steering Bord               0     0         Steering Bord              
9999     VIP 01                    1     0       VIP 01
9997     Singers                    1     0         Singers
9996     Korean Singers               1     1           Korean Singers
9998     Politicians                    1     1         Politicians The two nodes marked correct are "the leaves" even if technically they are not. They only have invalid children, so they should be the leaves.
Is there any chance I can tweak the CONNECT_BY_ISLEAF operator to take into consideration this invalid status?
Thanks

Answer 1

Not exactly sure what you are trying to do, but it looks like this:
SELECT  dpt_id, dpt_name,
        is_valid,
        is_valid * CONNECT_BY_ISLEAF CONNECT_BY_ISLEAF,
        LPAD(' ', (LEVEL-1) * 2) || dpt_name as indented_name
  FROM  departments
  START WITH dpt_parent_id IS NULL
  CONNECT BY PRIOR dpt_id = dpt_parent_id;
    DPT_ID DPT_NAME                         IS_VALID CONNECT_BY_ISLEAF INDENTED_NAME
         1 Company                                 1                 0 Company
         2 HR                                      1                 0   HR
        33 Logistics                               1                 0     Logistics
        39 Fleet management                        1                 1       Fleet management
        66 Recruitment                             1                 1     Recruitment
         3 SALES                                   1                 0   SALES
        31 Local Sales                             1                 1     Local Sales
        34 Asian Sales                             1                 1     Asian Sales
        38 American Sales                          1                 1     American Sales
        60 European Sales                          1                 0     European Sales
        61 Germany                                 1                 1       Germany
    DPT_ID DPT_NAME                         IS_VALID CONNECT_BY_ISLEAF INDENTED_NAME
        62 France                                  1                 0       France
       620 Paris                                   1                 1         Paris
       621 Marseilles                              1                 1         Marseilles
         4 IT                                      1                 0   IT
       222 Helpdesk                                1                 0     Helpdesk
       223 French Speaking                         1                 0       French Speaking
       224 Another level                           0                 0         Another level
         5 LEGAL                                   1                 1   LEGAL
      6325 VIP 02                                  1                 0   VIP 02
      6310 Another high level group                0                 0     Another high level group
      6311 Steering Bord                           0                 0     Steering Bord
    DPT_ID DPT_NAME                         IS_VALID CONNECT_BY_ISLEAF INDENTED_NAME
      9999 VIP 01                                  1                 0   VIP 01
      9997 Singers                                 1                 0     Singers
      9996 Korean Singers                          1                 1       Korean Singers
      9998 Politicians                             1                 1     Politicians
26 rows selected.
SQL> SY.