A special value called ______ is used to represent unknown or not applicable values of attributes in a tuple.

Composite

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Multi-valued

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Null

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Both B and C

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Solution

The correct option is D Null
Each value in a tuple is an indivisible value, i.e, it is not divisible into components within the framework of the basic relational model. This implies that composite and multi-valued attributes are not allowed. A special value, called Null, is used to represent unknown or not applicable values of attributes in a tuple.

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