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Physical data independence

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  • The minimum number of Cs that can be associated with one A is 1. I know this because the existence of the C to A relationship is mandatory. The maximum number of Cs that can be associated with one A is unlimited (or many). I know this because the cardinality of the C to A relationship is 1-M.

    ppt10p thienthanoze 12-11-2012 61 3   Download

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