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  1. #1
    Join Date
    Jan 2013

    Conceptual Data Modelling

    I've been tasked with creating a driving school database.

    Just wondering is a database model based on one moment in time or over a period of time?

    For example, I have a relationship between Car and Instructor. Basically an Instructor is allocated a car by a driving school.

    If it was a moment in time...
    Car (1..1) ------ (0..1) Instructor

    If it was over a period of time...
    Car (1..*) ------ (0..*) Instructor

  2. #2
    Join Date
    Feb 2004
    In front of the computer
    Most database products can do both, depending on how you configure them.

    In theory, theory and practice are identical. In practice, theory and practice are unrelated.

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