Tree of market - how to give link only to the lowest

Hello


Are my data table and model to model;
CREATE TABLE CODE_HIERARCHY
(
  PARENT_CODE  VARCHAR2(255 BYTE)                   NULL,
  CHILD_CODE   VARCHAR2(255 BYTE)                   NULL
);

Insert into CODE_HIERARCHY
   (PARENT_CODE, CHILD_CODE)
 Values
   ('KING', 'DUKE');
Insert into CODE_HIERARCHY
   (PARENT_CODE, CHILD_CODE)
 Values
   ('DUKE', 'LORD');
Insert into CODE_HIERARCHY
   (PARENT_CODE, CHILD_CODE)
 Values
   ('LORD', 'PEASANT');
Insert into CODE_HIERARCHY
   (PARENT_CODE, CHILD_CODE)
 Values
   ('KING', 'BUSINESS MAN');
Insert into CODE_HIERARCHY
   (CHILD_CODE)
 Values
   ('FREEMAN');
Insert into CODE_HIERARCHY
   (PARENT_CODE)
 Values
   ('HERMETIC');
COMMIT;
My desired output is such that each parent is only displayed with the lowest child through the links and any parent childless is not displayed, but a child without parents.

It is therefore my output desired, although the order of the data, I am not concerned about; -
Parent_Code     Child_Code
KING                PEASANT
KING                BUSINESS MAN
                      FREEMAN
DUKE              PEASANT
LORD              PEASANT
Someone tell me how please, I experimented and connect, but I do not get the result I want.

I'm on 9i DB, but access to GR 11, 2 also - the two versions of the solution - if different - are good.


With our thanks,


Robert.

Hello

As said Hoek, in Oracle 10 (and more), you can use CONNECT_BY_ISLEAF:

SELECT     CONNECT_BY_ROOT     parent_code          AS parent_code
,     child_code
FROM     code_hierarchy
WHERE     CONNECT_BY_ISLEAF     = 1
START WITH     child_code     IS NOT NULL
CONNECT BY     parent_code     = PRIOR child_code
;

Oracle 9 is not CONNECT_BY_ISLEAF. You can use a subquery.
Oracle 9 does not CONNECT_BY_ROOT, either, but you can get the same information using SYS_CONNECT_BY_PATH, like this:

WITH     got_path     AS
(
     SELECT     SUBSTR ( SYS_CONNECT_BY_PATH (parent_code, '/') || '/'
                 , 2
                 )     AS path
     ,     child_code
     FROM     code_hierarchy
     START WITH     child_code     IS NOT NULL
     CONNECT BY     parent_code     = PRIOR child_code
)
SELECT     SUBSTR ( path
            , 1
            , INSTR (path, '/') - 1
            )                  AS parent_code
,     child_code
FROM     got_path    p
WHERE     child_code  NOT IN (
                          SELECT  parent_code
                      FROM    code_hierarchy
                      WHERE   parent_code     IS NOT NULL
                      )
;

Tags: Database

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