mtom

Information about mtom

Published on October 24, 2007

Author: Abhil

Source: authorstream.com

Content

Resolving Many to Many Relationships:  Resolving Many to Many Relationships Data Modeling and Relational Database Design Objectives:  Objectives Identify the need for an intersection entity Create an intersection entity Create a UID for the new entity Identifying the Problem:  Identifying the Problem TITLE SUPPLIER supplied by supplier of In which entity would you store the attribute purchase price? From this diagram, can you tell which supplier instance provides “Casablanca”? # * prod code * name # * supplier no * name Intersection Entities:  Intersection Entities CATALOG ITEM available as SUPPLIER supplier of TITLE TITLE # * prod code * name # * supplier no * name * purchase price for for Unique Identifiers:  Unique Identifiers available as CATALOG ITEM SUPPLIER supplier of TITLE TITLE # * prod code * name # * supplier no * name * purchase price for for CATALOG ITEM available as SUPPLIER supplier of TITLE TITLE # * prod code * name # * supplier no * name # * item num * purchase price for for OR Summary:  Summary Identify the need for an intersection entity Create an intersection entity Create a UID for the new entity

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