VERY VERY URGENT SOLUTION NEEDED regarding SQL

Question

Dear Sir,
I have a table whose structure is
SQL> desc fof;
Name Null? Type
FOFID NUMBER(12)
PERSONID NUMBER(12)
RELATIONSHIPID NUMBER(2)
FPERSONID NUMBER(12)
STRENGTH NUMBER(1)
RELATIONSTATE VARCHAR2(15)
CTIME DATE
UTIME DATE
DELETED NUMBER(1)
EDITEDBY NUMBER(12)
The table has duplicate entries let me explain :
personid fpersonid
1 2
2 1
3 4
4 3
I want to keep only rows with one entry of every duplicate
personid fpersonid and not personid fpersonid
1 2 1 2
2 1
In other words keep a -> b and remove b -> a
Is there is any way you geeks can help i am ripping my hair out thinking about it
Please reply
:(

Answer 1

That works .....
Also the approach which i was thinking that to use cursor searching values in the table and deleting them
but in those also it deleted all records :(
something similar to this
--create table test_person_id ( personid number, fpersonid number)
--insert into test_person_id values ( 1,2 )
--insert into test_person_id values ( 2,1 )
--insert into test_person_id values ( 3,4 )
--insert into test_person_id values ( 4,3 )
--insert into test_person_id values ( 5,6 )
--insert into test_person_id values ( 7,8 )
--select * from test_person_id
--delete from test_person_id
--select * from test_person_id tpi where exists
--( select * from test_person_id tpi_1 where tpi.fpersonid = tpi_1.personid)
declare
  v_personid  number;
  v_fpersonid number;
  temp_personid  number;
  temp_fpersonid number;
  v_rowid rowid;
  cursor c1 is
    select rowid, personid, fpersonid from test_person_id;
BEGIN
  OPEN c1;
  LOOP
  FETCH c1
    INTO v_rowid, v_personid, v_fpersonid;
  DBMS_OUTPUT.PUT_LINE('Fetched values having rowid.. ' || v_rowid);
  EXIT WHEN c1%NOTFOUND;
  delete from test_person_id tpi where
  tpi.rowid != v_rowid
  and tpi.personid = v_fpersonid
  and tpi.fpersonid = v_personid returning tpi.personid, tpi.fpersonid into temp_personid, temp_fpersonid ;
  DBMS_OUTPUT.PUT_LINE(' Deleted record ' || temp_personid || '  ' || temp_fpersonid);
  END LOOP;
  close c1;
end;After running this only 2 records were left
5,6
7,8
Can anyone help in this regard...