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How is the data structure of System R different from the relational structure ?

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How is the data structure of System R different from the relational structure ?
posted Jan 30, 2014 by Anuj Yadav

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1 Answer

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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

answer Feb 1, 2014 by Vikas Upadhyay
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