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It is an attribute that does not occur in some candidate key.
A composite attribute has multiple components, each of which is atomic or composite.
Prime attribute are part of any candidate key. Non-prime attribute are not part of any candidate key.
A Complex attribute that is both Composite and Multi valued. Composite and Multivalued attributes can be nested arbitrarily to form a Complex attribute like Address.
A character attribute refers to a quality that a person possesses, such as funny personality or a kind heart.