SQL Oracle 继承关系数据库

Question

这是一张图片:

这是我在编码方面的进展:

CREATE TYPE appointment_list_type AS TABLE OF REF appointment_type;
/

CREATE OR REPLACE TYPE person_type AS OBJECT (
personID NUMBER,
Surname varchar2(10),
Forname varchar2(10),
dateOfBirth date,
AddressLine1 varchar2(30),
AddressLine2 varchar2(30),
Town varchar2(10),
contacTel1 varchar2(10),
contacTel2 varchar2(10)) NOT FINAL;
/

CREATE TYPE applicant_type UNDER person_type(
applicantID NUMBER,
maxPrice number(7,2),
desiredArea varchar2(10),
Attends appointment_list_type
);
/

CREATE TYPE salesperson_type UNDER person_type(
salespersonID NUMBER,
manager varchar2(10),
Makes appointment_list_type
);
/

这是创建人员的类型，将其分为继承的 Salesperson 和 Applicant。

CREATE TYPE appointment_type AS OBJECT(
appointmentID NUMBER,
Appdate date,
Apptime timestamp,
appointmentType varchar2(10),
levelOfInterest varchar2(10),
offerMade varchar2(10),
Made_by REF salesperson_type,
Attends_by REF applicant_type
);
/

这是约会类型，引用用于将它们关联在一起。

创建表:

CREATE TABLE person_table OF person_type (
personID PRIMARY KEY NOT NULL)
NESTED TABLE Attends STORE AS attend_meeting_table;

CREATE TABLE applicant_table OF applicant_type (
personID PRIMARY KEY NOT NULL)
NESTED TABLE Attends STORE AS attend_meeting_table;

CREATE TABLE salesperson_table OF salesperson_type (
personID PRIMARY KEY NOT NULL)
NESTED TABLE Makes STORE AS makes_meeting_table;    

CREATE TABLE appointment_table OF appointment_type (
appointmentID PRIMARY KEY NOT NULL,
SCOPE FOR (Made_by) IS person_table,
SCOPE FOR (Attends_by) IS person_table);

这也是我所做的一些代码，现在我的问题是:

继承如何直接在 Appointment 中执行 1 到 many？

我真的很困惑。谁能帮我解决这个问题？

Answer 1

phuh，我想我终于明白是什么困扰着你了......

目前applicant_table和salesperson_table中的约会REFd是完全独立的。这意味着应聘者可能会与销售人员开会，而这些销售人员实际上正在与其他人开会:)

当然，您希望所有约会都存储在 appointment_table 中。

这是对象 View 的完美用例。您根本不需要这些对象表。关系表更易于管理。

只需创建普通表，然后创建对象 View ，就像 SALESPERSON 的这个一样:

create view ov_salesperson as
 (select personID,
         salespersonID,
         SALESPERSON_TYPE
          (personID
           Surname,
           Forname,
           dateOfBirth,
           AddressLine1,
           AddressLine2,
           Town,
           contacTel1,
           contacTel2,
           salespersonID,
           manager,
           CAST 
            (MULTISET 
              (Select appointment_type
                       (appointmentID,
                        Appdate,
                        Apptime,
                        appointmentType,
                        levelOfInterest,
                        offerMade,
                        salesperson_id,
                        applicant_id
                       )
               From   appointment_table  A
               Where  A.salesperson_id = S.salesperson_id
              ) 
              as appointment_list_type 
            )
          ) as salesperson_obj
  from salesperson_table S
 );