1. Seminar 4: Demonstrating Object and Nested Relational Databases using Oracle
Purpose
The purpose of this seminar is to present how object-relational and nested-relational databases can be implemented using Oracle 9i.
Examples
EPD: Employee-Project-Department (see EPD.SQL printout)
EPD is designed first as a relational table.
Then EPD is redesigned using Project-Department (PD_Table) to be a nested-relation within Emp_PD table.
EPD is again redesigned using Employee-Department (ED_Table) to be a nested-relation within Proj_ED table.
Lines: Made up of Points
Lines are implemented using nested-relational features where each line is made up of private points (see NestedLines.SQL printout).
Then using object-relational features, lines are redesigned whereby lines can be constructed using public points i.e. points are shared among lines (see ObjRelLines.SQL printout).
Queries output is provided (see online at BlackBoard)
Seminar # 4: Object-Relational Databases
Advanced Databases (CM036)

2. Tasks EPD Nested Relational Lines Object Relational Lines
Download the file EPD.SQL from BlackBoard into your home directory (e.g. U:\CM036)
Open it using a text editor and read it.
Login to Oracle.
On the SQL plus prompt type by:
@U:\CM036\EPD.SQL
Watch out the relational and nested-relational queries and try to understand how they relate to each other.
Nested Relational Lines
Download the file NestedLines.SQL.
Run it on the SQL prompt by:
@U:\CM036\NestedLines.SQL
Try to understand the query and its result.
See how a method is invoked in the SQL query.
Object Relational Lines
Download the file ObjRelLines.SQL.
@U:\CM036\ObjRelLines.SQL
Try to understand the query and it result.
Compare and Contrast the Nested Relational and Object Relational implementation of Lines.
Seminar # 4: Object-Relational Databases
Advanced Databases (CM036)