How to insert into a table with a nested table which refer to another table

Question

Hello everybody,
As the title of this thread might not be very understandable, I'm going to explain it :
In a context of a library, I have an object table about Book, and an object table about Subscriber.
In the table Subscriber, I have a nested table modeling the Loan made by the subscriber.
And finally, this nested table refers to the Book table.
Here the code concerning the creation of theses tables :
Book :
create or replace type TBook as object
number int,
title varchar2(50)
Loan :
create or replace type TLoan as object
book ref TBook,
loaning_date date
create or replace type NTLoan as table of TLoan;
Subscriber :
create or replace type TSubscriber as object
sub_id int,
name varchar2(25)
loans NTLoan
Now, my problem is how to insert into a table of TSubscriber... I tried this query, without any success...
insert into OSubscriber values
*(1, 'LEVEQUE', NTLoan(*
select TLoan(ref(b), '10/03/85') from OBook b where b.number = 1)
Of course, there is an occurrence of book in the table OBook with the number attribute 1.
Oracle returned me this error :
SQL error : ORA-00936: missing expression
00936. 00000 - "missing expression"
Thank you for your help

Answer 1

1) NUMBER is a reserved word - you can't use it as identifier:
SQL> create or replace type TBook as object
  2  (
  3  number int,
  4  title varchar2(50)
  5  );
  6  /
Warning: Type created with compilation errors.
SQL> show err
Errors for TYPE TBOOK:
LINE/COL ERROR
0/0      PL/SQL: Compilation unit analysis terminated
3/1      PLS-00330: invalid use of type name or subtype name2) Subquery must be enclosed in parenthesis:
SQL> create table OSubscriber of TSubscriber
  2  nested table loans store as loans
  3  /
Table created.
SQL> create table OBook of TBook
  2  /
Table created.
SQL> insert
  2    into OBook
  3    values(
  4           1,
  5           'No Title'
  6          )
  7  /
1 row created.
SQL> commit
  2  /
Commit complete.
SQL> insert into OSubscriber
  2    values(
  3           1,
  4           'LEVEQUE',
  5           NTLoan(
  6                  (select TLoan(ref(b),DATE '1985-10-03') from OBook b where b.num = 1)
  7                 )
  8          )
  9  /
1 row created.
SQL> select  *
  2    from  OSubscriber
  3  /
    SUB_ID NAME
LOANS(BOOK, LOANING_DATE)
         1 LEVEQUE
NTLOAN(TLOAN(000022020863025C8D48614D708DB5CD98524013DC88599E34C3D34E9B9DBA1418E49F1EB2, '03-OCT-85'))
SQL> SY.