Implementation of many to many using object references : Object Table « Object Oriented Database « Oracle PL / SQL






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

Implementation of many to many using object references

   
SQL> CREATE OR REPLACE TYPE personType AS OBJECT
  2      (person_id        VARCHAR2(10),
  3       person_name      VARCHAR2(30))
  4      /


SQL> CREATE OR REPLACE TYPE courseType AS OBJECT
  2      (course_id        VARCHAR2(10),
  3       course_name      VARCHAR2(30))
  4      /

Type created.

SQL>
SQL>
SQL>
SQL>
SQL> CREATE TABLE emp OF personType
  2      (person_id NOT NULL,
  3       PRIMARY KEY (person_id));

Table created.

SQL>
SQL> CREATE TABLE Course OF courseType
  2      (course_id NOT NULL,
  3       PRIMARY KEY (course_id));

Table created.

SQL>
SQL>
SQL>
SQL>
SQL> CREATE TABLE Enrolls_in
  2      (emp    REF personType,
  3       course     REF courseType);

Table created.

SQL>
SQL>
SQL>
SQL>
SQL>
SQL> drop table emp;

Table dropped.

SQL>
SQL> drop table Course;

Table dropped.

SQL>
SQL>
SQL>
SQL> drop table Enrolls_in;

Table dropped.

SQL>
SQL>
SQL>








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