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My Suggestion How Is The Data Structure Of System R Different From The Relational Structure?

Discussion in 'Database Management' started by johnsmith123, Feb 22, 2017.

  1. johnsmith123

    Yellow Belt

    Joined:
    Dec 29, 2016
    Messages:
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    Unlike Relational systems in System R
    1. Domains are not supported
    2. Enforcement of candidate key uniqueness is optional
    3. Enforcement of entity integrity is optional
    4. Referential integrity is not enforced

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