An attribute whose value uniquely identifies an object is called a(n) _______.

1 answer:

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This is called a key attribute!

There are different types of key attributes!

Primary key is the key that is actually chosen, for example a social security number.

There is also a unique key, say our finger prints! they also uniquely identify humans, but usually we prefer to use social security number when we list people (a unique key could be a primary key if we chose so)

We could also identify people by their social security number and a name, but this is unnecessary, as social security number already gives a full identification. Such a reduntant key is called super key.

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