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What is the Duplicate data in multiple data files called?

What is the Duplicate data in multiple data files called?

What is the Duplicate data in multiple data files called?

(a)Data redundancy
(b)Always necessary in networked databases
(c)Typical of the relational model
(d)A characteristic of a hierarchy
(e)Both (b) and (c) above.

Johnson 29-Dec-2017

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