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Thread: CS403 GDB Idea Solution

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    16 CS403 GDB Idea Solution

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    "We use ER Data Model in conceptual database design instead of using other models but we never use ER data model in our logical database design"
    In software engineering, an entity-relationship model (ERM) is an
    abstract and conceptual representation of data. Entity-relationship
    modeling is a database modeling method, used to produce a type of
    conceptual schema or semantic data model of a system, often a relational
    database, and its requirements in a top-down fashion. Diagrams created
    by this process are called entity-relationship diagrams, ER diagrams, or
    Entity-Relationship Modeling
    The Entity-Relationship Model model serves as the foundation of many
    systems analysis and design methodologies, computer-aided software
    engineering (CASE) tools, and repository systems. The ER Model is the
    basis for IBM's Repository Manager/MVS and DEC's CDD/Plus.
    Dr. Peter Chen's original paper is commonly cited as the definitive
    reference for Entity Relationship Modeling. Chen did not in fact invent
    the concept; the basic ideas appear in earlier papers especially by
    practitioners, such as that by A. P. G. Brown.[ However, Chen did more
    than anyone to formalize and popularize the model, and to introduce it
    to the academic literature.
    The ER Model was adopted as the meta model ANSI Standard in
    Information Resource Directory System (IRDS), and the ER approach
    has been ranked at the top methodology for database design and one of
    the top methodologies in systems development by several surveys of
    Fortune 500 companies.[
    Last edited by viki; 07-30-2010 at 10:40 PM.
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