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

Answer:

Unlike Relational systems in System R
> Domains are not supported
> Enforcement of candidate key uniqueness is optional
> Enforcement of entity integrity is optional
> Referential integrity is not enforced

Asked In :: Accenture Sopra Steria

Anuradha M :: Sat, February 23, 2019, 5:07:02 am

Unlike Relational systems in System R
> Domains are not supported
> Enforcement of candidate key uniqueness is optional
> Enforcement of entity integrity is optional
> Referential integrity is not enforced