Hierarchical query: how to find out the root node
Hi to all.
I have a table with the following values:
user manager
Tom
John
Peter Tom
Steven Peter
Sean Peter
Jim John
Bill John
Ken Bill
So my hierachical query is as follow:
SELECT rpad(' ',(level-1)*3)||user as user_root, managerFROM My_Table
START WITH manager IS NULL
CONNECT BY manager = PRIOR user
ORDER SYBLINGS BY user
user_root manager
Tom
Peter Tom
Steven Peter
Sean Peter
John
Jim John
Bill John
Ken Bill
But I want also to know the top manager of each user. I want my output to be as follows:
user_root manager top_manager
Tom
Peter Tom Tom
Steven Peter Tom
Sean Peter Tom
John
Jim John John
Bill John John
Ken Bill Ken
Any hlp will be appreciated. Thanks a lot.
Regards, Beroetz
In 9i sys_connect_by_path can help:
SQL> select empno, ename, mgr
2 from emp
3 start with mgr is null
4 connect by prior empno = mgr
5 /
EMPNO ENAME MGR
7698 BLAKE
7499 ALLEN 7698
7521 WARD 7698
7654 MARTIN 7698
7844 TURNER 7698
7900 JAMES 7698
7839 KING
7566 JONES 7839
7788 SCOTT 7566
7876 ADAMS 7788
7902 FORD 7566
7369 SMITH 7902
7782 CLARK 7839
7934 MILLER 7782
14 rows selected.
SQL> select ename, mgr,
2 substr(sys_connect_by_path(ename,'/'),
3 2,instr(sys_connect_by_path(ename,'/'),'/',2)-2) top
4 from emp
5 start with mgr is null
6 connect by prior empno = mgr
7 /
ENAME MGR TOP
BLAKE
ALLEN 7698 BLAKE
WARD 7698 BLAKE
MARTIN 7698 BLAKE
TURNER 7698 BLAKE
JAMES 7698 BLAKE
KING
JONES 7839 KING
SCOTT 7566 KING
ADAMS 7788 KING
FORD 7566 KING
SMITH 7902 KING
CLARK 7839 KING
MILLER 7782 KING
14 rows selected.Rgds.
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