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Server Design Arcs and Sub Entities
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ER Diagram
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Transformation Options for Exclusivity
Supertype and subtypes TITLE Supertype Explicit subtypes Implicit subtypes Arcs MOVIE GAME
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The Supertype Option Supertype TITLE # PRODUCT CODE * TITLE TITLES
* TI_TYPE * TITLE . . . o CATEGORY o AUDIO o CATEGORY_CATEGORY o MINIMUM_MEMORY MOVIE * CATEGORY . . . o AUDIO Supertype GAME * CATEGORY . . . o MINIMUM MEMORY
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Supertype Option
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Result of Supertype Option
Discriminator Column
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The Explicit Subtype Option
GAMES # * PRODUCT_CODE * TITLE * CATEGORY o MINIMUM_MEMORY MOVIES # * PRODUCT_CODE * TITLE * CATEGORY o AUDIO . . . TITLE # PRODUCT CODE * TITLE MOVIE * CATEGORY . . . o AUDIO Explicit Subtype GAME * CATEGORY . . . o MINIMUM MEMORY
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Implementing Explicit Subtypes
Select the In Set check box for the subtypes only MOVIES GAMES Table Mappings In Set TITLE No Mapping --GAME Included --MOVIE Included
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The Implicit Subtype Option (rare and not recommended)
TITLE # PRODUCT CODE * TITLE TITLES # * PRODUCT_CODE * TITLE MOVIE * CATEGORY . . . o AUDIO MOVIES # * PRODUCT_CODE * TITLE * CATEGORY o AUDIO Implicit Subtype GAMES # * PRODUCT_CODE * TITLE * CATEGORY o MINIMUM_MEMORY . . . GAME * CATEGORY . . . o MINIMUM MEMORY
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Implementing Implicit Subtypes
Select the In Set check box for the supertype and the subtypes TITLES GAMES Table Mappings TITLE No Mapping Included --GAME --MOVIE In Set MOVIES
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The Ordinary Arc
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The Result
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The Arc Option (rarely applicable)
TITLE # PRODUCT CODE * TITLE MOVIES # * MO_ID * CATEGORY . . . o AUDIO MOVIE * CATEGORY . . . o AUDIO TITLES # * PRODUCT_CODE * TITLE . . . o MO_MO_ID o GA_GA_ID Arc GAMES # * GA_ID * CATEGORY . . . o MINIMUM_MEMORY GAME * CATEGORY . . . o MINIMUM MEMORY
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Implementing Arcs—First Run
Include supertypes and subtypes Table Mappings TITLE Included --GAME --MOVIE In Set No Mapping Choose tables only Run Options Types of elements that you want to create Tables Columns Keys
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Implementing Arcs—Second Run
Map the arc Table Mappings TITLE Mapped --GAME --MOVIE Arc Table TITLES MOVIES GAMES Entity In Set Select tables, columns, and keys Run Options Types of elements that you want to create Tables Columns Keys
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Choosing Implementation
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