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A single - valued attribute q , Is an attribute that can only have a single key reference. Cannot be repeated for more than one
A singlevalued attribute Is an attribute that can only have a single key reference. Cannot be repeated for more than one entity instance. Is not necessarily a simple attribute. Can have multiple values under special circumstances. 
A singlevalued attribute
Is an attribute that can only have a single key reference.
Cannot be repeated for more than one entity instance.
Is not necessarily a simple attribute.
Can have multiple values under special circumstances.
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