Connect by to get parents and grandparents

Question

Help! I have this:
NAME LEVEL
Available System Menus 1
Authentication Setup 2
User Maintenance 3
Role Maintenance 3
App Maintenance 3
System Maintenance 3
User -> Role Maintenance 3
Role -> App Maintenance 3
App -> System Maintenance 3
9 rows selected.
THE DIFFICULTY: This query gets me my down-tree from (and including) #2, but how do I get the up-tree (#1, which may or may not include #2)
SELECT app_name,app_id,super_app_id
FROM my_applications
START WITH app_id = 2
CONNECT BY PRIOR app_id = super_app_id;
APP_NAME APP_ID SUPER_APP_ID
Authentication Setup 2 1
User Maintenance 3 2
Role Maintenance 4 2
App Maintenance 5 2
System Maintenance 6 2
User -> Role Maintenance 7 2
Role -> App Maintenance 8 2
App -> System Maintenance 9 2
8 rows selected.
ALREADY TRIED, got a connect by loop error, also did this with app_id=1:
SELECT app_name,app_id,super_app_id
FROM apex_applications
START WITH app_id = 2
CONNECT BY PRIOR super_app_id = app_id;

Answer 1

Hi,
gpoz wrote:
Help! I have this:
NAME LEVEL
Available System Menus 1
Authentication Setup 2 ...Whenever you have a question, please post CREATE TABLE and INSERT statements for your sample data.
THE DIFFICULTY: This query gets me my down-tree from (and including) #2, but how do I get the up-tree (#1, which may or may not include #2)
SELECT app_name,app_id,super_app_id
FROM my_applications
START WITH app_id = 2
CONNECT BY PRIOR app_id = super_app_id;If that query moves in one direction (up or down), then changing where PRIOR goes will move in the opposite direction.
(Of course, if you have loops in your data, then terms like "up" and "down" aren't very helpful.)
ALREADY TRIED, got a connect by loop error, also did this with app_id=1:
SELECT app_name,app_id,super_app_id
FROM apex_applications
START WITH app_id = 2
CONNECT BY PRIOR super_app_id = app_id;You did it correctly. The error is because of your data. Use CONNECT BY NOCYCLE to avoid that error.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0). This is especially important with CONNECT BY queries, because every version since Oracle 7 has had major improvements in this area.
See the forum FAQ {message:id=9360002}