Connect by loop help

Question

Hi,
I have a table with 4 columns
parent number,
parent code varchar2(10),
child number,
child code varchar2(10)
The parent code and child code are catogries and the parent and child are IDs both have to be equal to each other for there to be a link.
i.e. a child 200 code 'C' with a parent 100 code 'T' only relatest to parent 100 code 'T'. There can be a parent 100 code 'C' and 'P' etc.
I am after a connect by loop that will give me all the relationships that this table contains.
Any help please

Answer 1

So what you want is something like this?
SQL> ed
Wrote file afiedt.buf
  1  with t as (select &id as id, '&code' as code from dual)
  2  --
  3  select 'Child' as type, pcchild as id, pcchildcode as code
  4  from afpc, t
  5  connect by pcparent = prior pcchild and pcparentcode = prior pcchildcode
  6  start with pcparent = id and pcparentcode = code
  7  union all
  8  select 'Parent' as type, pcparent as id, pcparentcode as code
  9  from afpc, t
10  connect by pcchild = prior pcparent and pcchildcode = prior pcparentcode
11* start with pcchild = id and pcchildcode = code
SQL> /
Enter value for id: 1960
Enter value for code: ACT
old   1: with t as (select &id as id, '&code' as code from dual)
new   1: with t as (select 1960 as id, 'ACT' as code from dual)
TYPE           ID CODE
Child        1957 ACT
Child        1961 ACT
Parent       2916 CAS
SQL> insert into afpc values (7, 3000, 'TST', 2916, 'CAS');
1 row created.
SQL> with t as (select &id as id, '&code' as code from dual)
  2  --
  3  select 'Child' as type, pcchild as id, pcchildcode as code
  4  from afpc, t
  5  connect by pcparent = prior pcchild and pcparentcode = prior pcchildcode
  6  start with pcparent = id and pcparentcode = code
  7  union all
  8  select 'Parent' as type, pcparent as id, pcparentcode as code
  9  from afpc, t
10  connect by pcchild = prior pcparent and pcchildcode = prior pcparentcode
11  start with pcchild = id and pcchildcode = code
12  /
Enter value for id: 1960
Enter value for code: ACT
old   1: with t as (select &id as id, '&code' as code from dual)
new   1: with t as (select 1960 as id, 'ACT' as code from dual)
TYPE           ID CODE
Child        1957 ACT
Child        1961 ACT
Parent       2916 CAS
Parent       3000 TST
SQL>