Question: ? ? ? ? ? ? ? i s a n a t t r i b u t e t h a t d

???????isanattributethatdoesnotphysicallyexistwithintheentityandisderivedviaanalgorithm.Forexample,theageattributemightbederivedbysubtractingthebirthdatefromthecurrentdate.
Simple attribute
Single-valued attribute
Derived attribute
Multivalued attribute

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