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ERD

  • December 14, 2014 at 4:53 am

    #299417

    Hi,

    I got this ERD and I have 2 questions about it:

    What is the minimum number of times that R2 can appers in the connection? and what is the maximum?

    A=5

    B=5

    C1=1

    C2=2

    THANK YOU

  • December 14, 2014 at 6:07 am

    #1764630

    The two ways that one could interpret this, Many2Many and One2Many both imply min=0 and max=(inf.)

    😎

    R2 => Many to many, min=0,max=(inf)

    +-----------+ +----+ +------+

    | A(a)+B(b) |-0---0<| R2 |>0---+-| C... |

    +-----------+ +----+ +------+

    R2 => One to many, min=0,max=(inf)

    +-----------+ +------+

    | A(a)+B(b) |>0---+-| C... |

    +-----------+ +------+

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