Need Help with Treat Function

Question

Im currently studying Oracle and SQL im really stuck on this.
if anyone could give me a hand it would be much appreciated.
drop table Property_tab force;
drop table Appointment_tab force;
drop table Person_tab force;
drop type view_list_type force;
drop type Property_type force;
drop type Appointment_type force;
drop type SalesPerson_type force;
drop type Applicant_type force;
drop type Person_type force;
create or replace type Person_type;
create or replace type SalesPerson_type;
create or replace type Applicant_type;
create or replace type Appointment_type;
create or replace type Property_type;
create type View_list_type as table of ref Appointment_type;
create type Person_type as object(
IdNo Number,
Surname VARCHAR(20),
Forename VARCHAR(20),
dateOfBirth date) NOT FINAL;
create or replace type SalesPerson_type UNDER person_type (
officeno Number,
makes View_list_type);
create type Applicant_type UNDER person_type (
aAddressLine1 VARCHAR(30),
aAddressLine2 VARCHAR(30),
aTown VARCHAR(20),
contactTel1 Number,
contactTel2 Number,
maxPrice Number,
desiredArea VARCHAR(30),
attends View_list_type);
create or replace type Appointment_type as object (
Appointment# Number,
AppDate date,
Time Number,
appointmentType VarChar(10),
LevelOfInterest VarChar(10),
is_Viewed_by ref Property_type
create type Property_type as object (
Property# VARCHAR(30),
dateOfRegistration Date,
housetype VARCHAR(30),
bedrooms Number,
receptionRooms Number,
bathrooms Number,
garage Number,
garden Number,
regionArea VarChar(30),
pAddressLine1 VarChar(30),
pAddressLine2 VarChar(30),
pCode VarChar(7),
price INTEGER,
relatesto View_list_type
create table Person_tab of Person_type (
IdNo primary key NOT NULL);
create table Property_tab of Property_type
nested table relatesto store as view_Appointment_table;
create table Appointment_tab of Appointment_type (
scope for (is_Viewed_by) is Property_tab);
insert into Property_tab
values (1,'18-sep-09', 'Detatched', 4, 1, 2, 1, 2, 'Wales', '42 Spooner St', 'Bridgend', 'CF347LS', 120000, View_list_type());
insert into Property_tab
values (2,'21-oct-10', 'Semi-Detatched', 4, 1, 2, 1, 2, 'Wales', '44 Spooner St', 'Bridgend', 'CF348LS', 200000, View_list_type());
insert into Property_tab
values (3,'1-dec-09', 'Detatched', 4, 1, 2, 1, 2, 'Wales', '42 Roath St', 'Cardiff', 'CF407RQ', 125000, View_list_type());
INSERT INTO person_tab VALUES (SalesPerson_type(123, 'Steve', 'Jones', '12-JAN-76', 401, View_list_type()));
INSERT INTO person_tab VALUES (SalesPerson_type(234, 'Brian', 'Williams', '18-oct-85', 401, View_list_type()));
INSERT INTO person_tab VALUES (SalesPerson_type(345, 'John', 'Johnson', '11-FEB-75', 402, View_list_type()));
INSERT INTO person_tab VALUES (SalesPerson_type(456, 'Mike', 'Adams', '2-DEC-81', 402, View_list_type()));
INSERT INTO person_tab VALUES (Applicant_type(111, 'Marie', 'Michaels', '16-DEC-81', '12 Merthyr RD', 'Mid Glam','Bridgend', 0165666123, 0780089623, 250000, 'Bridgend', View_list_type()));
underneath doesnt work this is what im stuck on
INSERT INTO Appointment_tab
SELECT 1,'12-JAN-12', 1203,'Viewing', 'HIGH'
Treat (REF (C) AS REF Person_type),
Treat (REF (D) AS REF Person_type),
REF (E),
FROM Person_tab C, Person_tab D, Property_tab E
WHERE Treat (Value (C) AS Person_type).IdNo = 123 AND
Treat (value (D) AS Person_type).IdNo = 111 AND
E.Property_type.Property# = 1;

Answer 1

I would always restrict O-R to your view and packages interfaces.
It's normally a good idea to stick to orthodox relational modelling when it comes to the table design.
Is this what you're after?
SQL> INSERT INTO Appointment_tab
  2  SELECT Appointment_type(
  3        1
  4  ,     TO_DATE('12-JAN-12','DD-MON-RR')
  5  ,     1203
  6  ,     'Viewing'
  7  ,    'HIGH'
  8  ,     REF (E))
  9  FROM  Person_tab C
10  ,     Person_tab D
11  ,     Property_tab E
12  WHERE Treat (Value (C) AS Person_type).IdNo = 123
13  AND   Treat (value (D) AS Person_type).IdNo = 111
14  AND   Treat (Value(E) AS Property_type).Property# = 1;
1 row created.
Elapsed: 00:00:00.03
SQL>
SQL> select * from appointment_tab;
APPOINTMENT# APPDATE         TIME APPOINTMEN LEVELOFINT
IS_VIEWED_BY
           1 12-JAN-12       1203 Viewing    HIGH
0000220208B41108491D309848E040440A5B681B61B41108491D2E9848E040440A5B681B61There must be some mistake somewhere as your appointment type does not have any person/applicant/sales_person attributes (so there's no point in selecting them under the current definition).
Edited by: Dom Brooks on Dec 15, 2011 4:40 PM