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Seminar 10: Demonstrating Object and Nested Relational Databases using Oracle

Seminar 10: 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 9 i . Examples EPD: Employee-Project-Department (see EPD.SQL printout)

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Seminar 10: Demonstrating Object and Nested Relational Databases using Oracle

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  1. Seminar 10: 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 # 10: Object-Relational Databases Advanced Databases (CM036)

  2. Tasks • EPD • 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. • Open it using a text editor and read it. • 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. • Open it using a text editor and read it. • Run it on the SQL prompt by: @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 # 10: Object-Relational Databases Advanced Databases (CM036)

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