Implementation of multiple inheritance relationship : Object Table « Object Oriented Database « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Object Oriented Database
  3. Object Table

Implementation of multiple inheritance relationship

   
SQL> CREATE TABLE Person
  2      (id         VARCHAR2(10) NOT NULL,
  3       name       VARCHAR2(20),
  4       address    VARCHAR2(35),
  5       PRIMARY KEY (id));


SQL>
SQL>
SQL> CREATE TABLE emp
  2      (id         VARCHAR2(10) NOT NULL,
  3       course     VARCHAR2(10),
  4       year       VARCHAR2(4),
  5       PRIMARY KEY (id),
  6       FOREIGN KEY (id) REFERENCES Person (id) ON DELETE CASCADE);

Table created.

SQL>
SQL>
SQL>
SQL> CREATE TABLE Staff
  2      (id         VARCHAR2(10) NOT NULL,
  3       department VARCHAR2(10),
  4       room_no    VARCHAR2(4),
  5       PRIMARY KEY (id),
  6       FOREIGN KEY (id) REFERENCES Person (id) ON DELETE CASCADE);

SQL>
SQL>
SQL> CREATE TABLE Tutor
  2      (id         VARCHAR2(10) NOT NULL,
  3       no_hours   NUMBER,
  4       rate       NUMBER,
  5       PRIMARY KEY (id) ,
  6       FOREIGN KEY (id) REFERENCES Person (id) ON DELETE CASCADE);

Table created.

SQL>
SQL>
SQL> drop table Person cascade constraints;

Table dropped.

SQL>
SQL>
SQL> drop table emp;

Table dropped.

SQL>
SQL> drop table Staff;


SQL>
SQL> drop table Tutor;

Table dropped.

SQL>








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