Managing Hierarchical tables

Question

Hi all,
I need a query to get the emp hirarchical table as follows: (BASED ON EMP TABLE)
KING --> JONES --> SCOTT
KING --> JONES --> FORD
and so on...
In other words, all the path from the president to the last level of the organization in one line each. For example:
King is manager of Jones, and Jones is chief of Scott and Ford, so I want to display both paths.
Moreover, I don't want to filter anything, I want to show all the possible paths for all the employees.
I would appreciate your help.
Thanks.

Answer 1

In Oracle 8i, you can do the same thing, using the following packaged function by Solomon Yakobson:
CREATE OR REPLACE
PACKAGE Hierarchy
  IS
        TYPE BranchTableType IS TABLE OF VARCHAR2(4000)
          INDEX BY BINARY_INTEGER;
        BranchTable BranchTableType;
        FUNCTION Branch(vLevel          IN NUMBER,
                        vValue          IN VARCHAR2,
                        vDelimiter      IN VARCHAR2 DEFAULT CHR(0))
                        RETURN VARCHAR2;
        PRAGMA RESTRICT_REFERENCES(Branch,WNDS);
END Hierarchy;
Package created.
CREATE OR REPLACE
PACKAGE BODY Hierarchy
  IS
        ReturnValue VARCHAR2(4000);
  FUNCTION Branch(vLevel        IN NUMBER,
                  vValue        IN VARCHAR2,
                  vDelimiter    IN VARCHAR2 DEFAULT CHR(0))
                  RETURN VARCHAR2
   IS
   BEGIN
        BranchTable(vLevel) := vValue;
        ReturnValue := vValue;
        FOR I IN REVERSE 1..vLevel - 1 LOOP
          ReturnValue := BranchTable(I)|| vDelimiter || ReturnValue;
        END LOOP;
        RETURN ReturnValue;
  END Branch;
END Hierarchy;
Package body created.
COLUMN   name FORMAT A10
COLUMN   val  FORMAT A35
SELECT   name, empno, mgr, val
FROM     (SELECT     LPAD (' ', ( level - 1 )) || ename name, empno, mgr,
                     hierarchy.branch (LEVEL, ename, ' --> ') AS val
          FROM       emp
          START WITH mgr IS NULL
          CONNECT BY PRIOR empno = mgr)
ORDER BY 4
NAME            EMPNO        MGR VAL                                                               
KING             7839            KING                                                              
BLAKE           7698       7839 KING --> BLAKE                                                    
  ALLEN          7499       7698 KING --> BLAKE --> ALLEN                                          
  JAMES          7900       7698 KING --> BLAKE --> JAMES                                          
  MARTIN         7654       7698 KING --> BLAKE --> MARTIN                                         
  TURNER         7844       7698 KING --> BLAKE --> TURNER                                         
  WARD           7521       7698 KING --> BLAKE --> WARD                                           
CLARK           7782       7839 KING --> CLARK                                                    
  MILLER         7934       7782 KING --> CLARK --> MILLER                                         
JONES           7566       7839 KING --> JONES                                                    
  FORD           7902       7566 KING --> JONES --> FORD                                           
   SMITH         7369       7902 KING --> JONES --> FORD --> SMITH                                 
  SCOTT          7788       7566 KING --> JONES --> SCOTT                                          
   ADAMS         7876       7788 KING --> JONES --> SCOTT --> ADAMS                                
14 rows selected.