Trying to build a query

Question

Hello,
I am using oracle 10g
I have a tableA i.e. it takes the user hierarchy.
which has the table columns like group1,group2,group3
group1 is the manager1,group2 is under group1,group3 is under group2 i mean the data.
and the username
Now what i want is
If a username selected is abc
If its comes as group1 then the immediate group2 should be selected.
If abc is group2 then group3 should be selected.
How to write this query
I tried like
select
case when username=group1 then (select group2 from tableA a where username='abc')
end
from tableA b
where username='abc'
But in this case gets error like single row sub query returnd more rows.
I can have multiple people whose group1 and group2 are same.
like if group3 value is def group2 is wer and group1 is qwe
then again group3 value is wdf group2 is wer and group1 is qwe
I am adding some create and insert commands
create table tableA
group1 varchar2(100);
group2 varchar2(100);
group3 varchar2(100);
username varchar2(100);
Here group1 is the boss, group2 is under him,group3 is under group2
username can be group1/group2/ group3
Table just tells which level a user stands and who are the bosses
insert into tableA(group1,group2,group3,usrename) values ('[email protected]','[email protected]','[email protected]','[email protected]');
insert into tableA(group1,group2,group3,usrename) values ('[email protected]','[email protected]','','[email protected]');
insert into tableA(group1,group2,group3,usrename) values ('[email protected]','','','[email protected]');
Now output should be
I have a text field where a user can type any username.
Now it enters and clicks go button.
Should be able to see
the people under him
Means if in the text field a user enters
[email protected]
Then since def and ghi is under him he should be able to see
[email protected]
[email protected] as 2 rows.
Thanks
Edited by: user123 on Jul 12, 2011 8:24 AM

Answer 1

it will be better if you post some sample data and output. i am assuming based on your posting that you want a heirarchical query result. i posted here some examples that might be of some help to you.
SQL> select * from emp;
EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO
7902 FORD       ANALYST    7566 03-Dec-81     3000.00               20
7839 KING       PRESIDENT       17-Nov-81     5000.00               10
7698 BLAKE      MANAGER    7839 01-May-81     2850.00               30
7782 CLARK      MANAGER    7839 09-Jun-81     2450.00               10
7788 SCOTT      ANALYST    7566 09-Dec-82     3000.00               20
7844 TURNER     SALESMAN   7698 08-Sep-81     1500.00      0.00     30
7876 ADAMS      CLERK      7788 12-Jan-83     1100.00               20
7900 JAMES      CLERK      7698 03-Dec-81      950.00               30
7934 MILLER     CLERK      7782 23-Jan-82     1300.00               10
7945 CINDY      SALESMAN   7698 16-Jan-83     1800.00               30
7950 TINA       SALESMAN   7698 18-Jan-83     1850.00               30
11 rows selected
SQL> SELECT lpad(' ',2*(level-1),' ')||ename employee,  empno employee_no, job
  2  FROM emp
  3  START WITH job = 'PRESIDENT'
  4  CONNECT BY PRIOR empno = mgr
  5  ;
EMPLOYEE                                                                         EMPLOYEE_NO JOB
KING                                                                                    7839 PRESIDENT
  BLAKE                                                                                 7698 MANAGER
    TURNER                                                                              7844 SALESMAN
    JAMES                                                                               7900 CLERK
    CINDY                                                                               7945 SALESMAN
    TINA                                                                                7950 SALESMAN
  CLARK                                                                                 7782 MANAGER
    SCOTT                                                                               7788 ANALYST
    ADAMS                                                                               7876 CLERK
    FORD                                                                                7902 ANALYST
    MILLER                                                                              7934 CLERK
11 rows selected
SQL>