Here's one way.
It uses a temporary table, as a CONNECT BY cannot be done on the
%_CONSTRAINTS view.
Jared
create test data
--------------------------------------------------------------------------------------------------
drop table t3;
drop table t2;
drop table t1;
create table t1 ( pk number );
create table t2 ( pk number, t1_pk number );
create table t3 ( pk number, t2_pk number );
create table t4 ( pk number, t3_pk number );
alter table t1 add constraint t1_pk
primary key(pk);
alter table t2 add constraint t2_pk
primary key(pk);
alter table t3 add constraint t3_pk
primary key(pk);
alter table t4 add constraint t4_pk
primary key(pk);
alter table t2 add constraint t2_t1_pk
foreign key(t1_pk)
references t1(pk);
alter table t3 add constraint t3_t2_pk
foreign key(t2_pk)
references t2(pk);
alter table t4 add constraint t4_t3_pk
foreign key(t3_pk)
references t3(pk);
--------------------------------------------------------------------------------------------------
-- create temp table
drop table r1;
create global temporary table r1
on commit delete rows
--create table r1
as
select
c.table_name child
, p.table_name parent
, p.constraint_name
, c.constraint_name fk_constraint
, c.delete_rule
from dba_constraints c, dba_constraints p
where 1=0
/
insert into r1
select *
from
(
select
c.table_name child
, p.table_name parent
, p.constraint_name
, c.constraint_name fk_constraint
, c.delete_rule
from dba_constraints c, dba_constraints p
where c.owner = 'JKSTILL'
--and c.table_name like 'T%'
and c.constraint_type in ('R')
and c.status = 'ENABLED'
and p.owner = c.r_owner
and p.constraint_name = c.r_constraint_name
) a
/
--------------------------------------------------------------------------------------------------
-- report
col child format a10
col parent format a20
col pad format a20
col constraint_name format a30
col r_constraint_name format a30
col tlevel noprint
set line 120
select
tlevel
, parent
, constraint_name
, child
, fk_constraint
, delete_rule
from (
select
level tlevel
, lpad(parent, level*3) parent
, constraint_name
, child
, fk_constraint
, delete_rule
from r1
start with parent = 'T1'
connect by prior child = parent
)
order by tlevel
/
"Krishnaswamy, Ranganath" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
12/18/2002 11:13 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Direct and indirect foreign key relationships in SQL or Pl/Sql
Hi all,
How do I find out the direct and indirect foreign key
relationships?
Say, for example there are four tables A, B, C and D of which A is the
parent table and B, C and D are child tables. Say B and C are related to
A
directly and D is related to A through C. How do I find out this indirect
relationship apart from the direct relationships? Any help in this regard
is very much appreciated.
Thanks and Regards,
Ranganath
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