Finding the highest parent...

Question

Hi Guys,
I have two tables.
First table is tblTeam:
Team_ID ~ Team_Name
1 ~ Overall Accounting Group
2 ~ Accounting - USA
3 ~ Accounting - Europe
4 ~ Accounting - Texas
5 ~ Accounting - NYC
6 ~ Accounting - London
7 ~ Accounting - Dublin
The second table is the relationship table, tblTeamRel. It has 2 one to many relationships with tblTeam, a parent and a child relationship:
Parent_Team_ID ~ Child_Team_ID
1 ~ 2
1 ~ 3
2 ~ 4
2 ~ 5
3 ~ 6
3 ~ 7
I want to write a query where you give the a team_ID and you get its highest team_ID back, for example:
I enter team_ID 7 (Accounting - Dublin) and it returns team_id 1 (Overall Accounting Group)
or I enter team_ID 2 (Accounting - USA) and it returns team_id 1 (Overall Accounting Group)
Im not sure where to start with this query so any examples you can show me or any help you can give me would be greatly appreciated...
Thanks,
Sean
Edited by: Hazy on May 14, 2010 1:35 PM

Answer 1

Maybe something like this?
SQL> var childTeam NUMBER;
SQL>
SQL> exec :childTeam := 7;
PL/SQL procedure successfully completed.
SQL> WITH tblTeam AS
  2  (
  3          SELECT 1 AS TEAM_ID, 'Overall Accounting Group' AS TEAM_NAME FROM DUAL UNION ALL
  4          SELECT 2 AS TEAM_ID, 'Accounting - USA' AS TEAM_NAME FROM DUAL UNION ALL
  5          SELECT 3 AS TEAM_ID, 'Accounting - Europe' AS TEAM_NAME FROM DUAL UNION ALL
  6          SELECT 4 AS TEAM_ID, 'Accounting - Texas' AS TEAM_NAME FROM DUAL UNION ALL
  7          SELECT 5 AS TEAM_ID, 'Accounting - NYC' AS TEAM_NAME FROM DUAL UNION ALL
  8          SELECT 6 AS TEAM_ID, 'Accounting - London' AS TEAM_NAME FROM DUAL UNION ALL
  9          SELECT 7 AS TEAM_ID, 'Accounting - Dublin' AS TEAM_NAME FROM DUAL
10  ), tblTeamRel AS
11  (
12          SELECT 1 AS PARENT_TEAM_ID, 2 AS LD_PARENT_ID FROM DUAL UNION ALL
13          SELECT 1 AS PARENT_TEAM_ID, 3 AS LD_PARENT_ID FROM DUAL UNION ALL
14          SELECT 2 AS PARENT_TEAM_ID, 4 AS LD_PARENT_ID FROM DUAL UNION ALL
15          SELECT 2 AS PARENT_TEAM_ID, 5 AS LD_PARENT_ID FROM DUAL UNION ALL
16          SELECT 3 AS PARENT_TEAM_ID, 6 AS LD_PARENT_ID FROM DUAL UNION ALL
17          SELECT 3 AS PARENT_TEAM_ID, 7 AS LD_PARENT_ID FROM DUAL
18  )
19  /* END SAMPLE DATA */
20  SELECT  parent_team_id
21  ,       team_name
22  FROM    tblTeam
23  JOIN    tblTeamRel ON tblTeam.team_id = tblTeamRel.parent_team_id
24  WHERE CONNECT_BY_ISLEAF = 1
25  START WITH ld_parent_id = :childTeam
26  CONNECT BY PRIOR  parent_team_id = ld_parent_id
27  /
      PARENT_TEAM_ID TEAM_NAME
                   1 Overall Accounting Group
SQL> exec :childTeam := 2;
PL/SQL procedure successfully completed.
SQL> /
      PARENT_TEAM_ID TEAM_NAME
                   1 Overall Accounting GroupIn the future you'd probably get a faster response in the {forum:id=75} forum.
Additionally, it's always helpful to provide the following:
1. Oracle version (SELECT * FROM V$VERSION)
2. Sample data in the form of CREATE / INSERT statements.
3. Expected output
4. Explanation of expected output (A.K.A. "business logic")
5. Use \ tags for #2 and #3. See FAQ (Link on top right side) for details.
You provided #3 and #4. You kind of provided #2 but not in a usable form.
Edited by: Centinul on May 14, 2010 1:23 PM