Specify an object in INSERT INTO clause

Question

I need to INSERT or UPDATE specific object attribute.
Example :
CREATE TYPE a AS OBJECT( attr1 varchar2(10), attr2 varchar2(10));
CREATE TYPE b AS OBJECT( attr3 varchar2(10), attr4 a);
CREATE TYPE c AS TABLE OF b;
CREATE TYPE d AS OBJECT( attr5 varchar2(10), attr6 b, attr7 c);
CREATE TABLE d_tab OF d
NESTED TABLE attr7 STORE AS attr7_nest;
It's easy to INSERT an object but how can I insert a specified attribute of an object ?
I try these :
insert into d_tab (attr5, attr6.attr3) values ('TEST2','TEST2'); --> ORA-00904
insert into d_tab (attr5, attr6) values ('TEST2','TEST2'); --> ORA-00932
insert into d_tab (attr5, attr6) values ('TEST2',b('TEST2')); --> ORA-02315
and what about attr7 ???
How insert or update only the attr1 of object b of first row of table_type c of table d_tab ??

Answer 1

Not really of common use, I think, but WITH CHECK OPTION option could be one reason for using that. Let's see an example :
SQL> INSERT INTO
  2  (SELECT empno, ename, deptno FROM emp WHERE deptno < 20)
  3* VALUES (1111, 'Brown', 30)
SQL> /
1 row created.That's the same as
SQL> insert into emp (empno, ename, deptno)
  2  values(1111, 'Brown', 30);But
SQL> INSERT INTO
  2  (SELECT empno, ename, deptno FROM emp WHERE deptno < 20 WITH CHECK OPTION)
  3* VALUES (2222, 'Green', 30)
SQL> /
(SELECT empno, ename, deptno FROM emp WHERE deptno < 20
ERROR at line 2:
ORA-01402: view WITH CHECK OPTION where-clause violation
SQL>Paul