Define the terms - key attribute and value set, Data Structure & Algorithms

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Define the terms

i) Key attribute

ii) Value set

Key attribute: An entity type usually has an attribute whose values are distinct from every individual entity in the collection. Such an attribute is called a key attribute.

Value set: Every simple attribute of an entity type is associated with a value set that specifies the set of values that might be assigned to that attribute for every individual entity.

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