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

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Oracle PL / SQL » Object Oriented Database » 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>

   
    
    
  
Related examples in the same category
1.Crate table with object column
2.Use a table alias and the name of the object
3.Create table with user defined type as column
4.Create a table with user define varray as column type
5.Create a table with nested user defined type as column
6.Object table: a table of type
7.Use user-defined varray type as column type
8.Nested table
9.Create a table based on user-defined object only
10.Implementation of multiple inheritance relationship
11.Implementation of one to many using object references
12.Create table based on single data type
13.Create table with nested types
14.Create type and use it as table column
15.One to one using object references
16.Use user-defined type to combine query logic
17.Create a new type and add it to a table
18.Multilevel aggregation relationships using nested tables
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