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    Database Models

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    Please someone help me.
    Hierarchical, Network, Relational, and Object-Oriented Of the four types of databases listed above which designs are used for the following websites?
    The Internet Movie Database (IMDb): http://www.imdb.com/
    Source: The Internet Movie Database (IMDb). Retrieved from http://www.imdb.com/
    • The Internet Public Library (IPL): http://www.ipl.org/
    Source: The Internet Public Library. Retrieved from http://www.ipl.org/
    • The Yellow Pages: http://www.yellowpages.com/
    Source: The Yellow Pages. Retrieved from http://www.yellowpages.com/
    • Popular Search Engine: http://www.google.com
    Source: Google. Retrieved from http://www.google.com
    • WebMD: http://www.webmd.com
    Source: WebMD. Retrieved from http://www.webmd.com
    I am completely lost to me they are all relational but that is not correct please help me understand what they are and why

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    Solution Preview

    Dear Student,
    Fields/Records structured in nodes
    Nodes are points connected as branches
    One parent per node
    Parent can have several child nodes (One-Many Relationships)
    Eg. Airline Reservation System
    Departure California
    Arriv LA Chicago NY
    Flight No 110 130 209
    Passanger Peter Paul Linda

    Applications were IBM Information Management System (IMS) and the RDM Mobile

    Hierarchical Node arrangement
    Each child to have a parent node, Will have more than one parent if in a Many to Many relationship
    Additional Nodes are called Pointers
    A node can be accessed via more than one route
    Eg. University Student System
    Course ...

    Solution Summary

    The solution explains the data models and considers several internet based databases touching on hierarchical, network, relational and object-oriented with examples.