Can't get tree to work right

Question

i have written an sql to create a tree but i am now getting the error:
ORA-20001: read_meta_data error: ORA-01436: CONNECT BY loop in user data
below is my sql
select case when connect_by_isleaf = 1 then 0
            when level = 1             then 1
            else                           -1
       end as status,
       level,
       d as title,
       null as icon,
       r as value,
       null as tooltip,
       null as link
from (select 'Employee: ' || SUB_NAME d, SUB_NUM r, TASK_NUM parent from SUBTASK
       union all
      select 'Taskss: ' || TASK_NAME d, TASK_NUM r, PROJ_NUM parent from TASK
       union all
      select 'DPI Projects: ' || PROJ_NAME d, PROJ_NUM r, null parent from PROJECTS)
start with parent is null
connect by prior r = parent
order siblings by dAny help would be wonderful.
thanks,
Edited by: KySarge1981 on Aug 17, 2010 2:32 PM
Edited by: KySarge1981 on Aug 18, 2010 7:42 AM

Answer 1

Not to kick a guy when he's down, but this is what I would have preferred be provided to set up a test case:
CREATE TABLE PROJECTS(
  PROJ_NUM  VARCHAR2(4)    NOT NULL,
  PROJ_NAME VARCHAR2(4000) NOT NULL
CREATE TABLE TASK(
  PROJ_NUM  VARCHAR2(4)    NOT NULL,
  TASK_NUM  VARCHAR2(4)    NOT NULL,
  TASK_NAME VARCHAR2(4000) NOT NULL
CREATE TABLE SUBTASK(
  PROJ_NUM VARCHAR2(4)    NOT NULL,
  TASK_NUM VARCHAR2(4)    NOT NULL,
  SUB_NUM  VARCHAR2(4)    NOT NULL,
  SUB_NAME VARCHAR2(4000) NOT NULL
INSERT INTO PROJECTS VALUES('0001','PROJ_0001');
INSERT INTO PROJECTS VALUES('0002','PROJ_0002');
INSERT INTO PROJECTS VALUES('0003','PROJ_0003');
INSERT INTO TASK VALUES('0001','0001','PROJ_0001_TASK_0001');
INSERT INTO TASK VALUES('0001','0002','PROJ_0001_TASK_0002');
INSERT INTO TASK VALUES('0002','0001','PROJ_0002_TASK_0001');
INSERT INTO TASK VALUES('0002','0002','PROJ_0002_TASK_0002');
INSERT INTO TASK VALUES('0003','0001','PROJ_0003_TASK_0001');
INSERT INTO TASK VALUES('0003','0002','PROJ_0003_TASK_0002');
INSERT INTO SUBTASK VALUES('0001','0001','0001','PROJ_0001_TASK_0001_SUB_0001');
INSERT INTO SUBTASK VALUES('0001','0001','0002','PROJ_0001_TASK_0001_SUB_0002');
INSERT INTO SUBTASK VALUES('0001','0002','0001','PROJ_0001_TASK_0002_SUB_0001');
INSERT INTO SUBTASK VALUES('0001','0002','0002','PROJ_0001_TASK_0002_SUB_0002');
INSERT INTO SUBTASK VALUES('0002','0001','0001','PROJ_0002_TASK_0001_SUB_0001');
INSERT INTO SUBTASK VALUES('0002','0001','0002','PROJ_0002_TASK_0001_SUB_0002');
INSERT INTO SUBTASK VALUES('0002','0002','0001','PROJ_0002_TASK_0002_SUB_0001');
INSERT INTO SUBTASK VALUES('0002','0002','0002','PROJ_0002_TASK_0002_SUB_0002');
INSERT INTO SUBTASK VALUES('0003','0001','0001','PROJ_0003_TASK_0001_SUB_0001');
INSERT INTO SUBTASK VALUES('0003','0001','0002','PROJ_0003_TASK_0001_SUB_0002');
INSERT INTO SUBTASK VALUES('0003','0002','0001','PROJ_0003_TASK_0002_SUB_0001');
INSERT INTO SUBTASK VALUES('0003','0002','0002','PROJ_0003_TASK_0002_SUB_0002');It would make it so much easier for people trying to help if we didn't have to do monkey around to get to the root of the problem. Not to mention it exponentially increases the chances of people answering your question.
But anyway....on to a solution.
With the tree root as 'PROJECT', the query would be:
--Root
SELECT 'PROJECTS' ID,
       NULL       PID,
       'Projects' NAME,
       NULL       LINK,
       NULL       A1,
       NULL       A2
  FROM DUAL
UNION ALL
--Projects
SELECT PROJ_NUM,
       'PROJECTS',
       PROJ_NAME,
       NULL,
       NULL,
       NULL
  FROM PROJECTS
UNION ALL
--Tasks
SELECT PROJ_NUM||':'||TASK_NUM,
       PROJ_NUM,
       TASK_NAME,
       NULL,
       NULL,
       NULL
  FROM TASK
UNION ALL
--SubTasks
SELECT PROJ_NUM||':'||TASK_NUM||':'||SUB_NUM,
       PROJ_NUM||':'||TASK_NUM,
       SUB_NAME,
       NULL,
       NULL,
       NULL
  FROM SUBTASKand the result is:
Projects 
-->PROJ_0001
  -->PROJ_0001_TASK_0001
    -->PROJ_0001_TASK_0001_SUB_0001
    -->PROJ_0001_TASK_0001_SUB_0002
  -->PROJ_0001_TASK_0002
    -->PROJ_0001_TASK_0002_SUB_0001
    -->PROJ_0001_TASK_0002_SUB_0002
-->PROJ_0002
  -->PROJ_0002_TASK_0001
    -->PROJ_0002_TASK_0001_SUB_0001
    -->PROJ_0002_TASK_0001_SUB_0002
  -->PROJ_0002_TASK_0002
    -->PROJ_0002_TASK_0002_SUB_0001
    -->PROJ_0002_TASK_0002_SUB_0002
-->PROJ_0003
  -->PROJ_0003_TASK_0001
    -->PROJ_0003_TASK_0001_SUB_0001
    -->PROJ_0003_TASK_0001_SUB_0002
  -->PROJ_0003_TASK_0002
    -->PROJ_0003_TASK_0002_SUB_0001
    -->PROJ_0003_TASK_0002_SUB_0002 Hope that gets you back on track.