What is the meaning of "minimal key"?

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primary-key relational-theory terminology candidate-key

                          In the definition, it says *minimal key* is a minimal set of attributes needed to identify the table. Does the "minimal" part mean "minimal number of attributes" or "cannot be eliminated"?

For example:

- For a relation R(A, B, C, D, E, F), the closure of A, BC, and DEF are all {A, B, C, D, E, F}.

Are they all minimal keys? Or is only A the minimal key?

Asked by Stephanie Mussi (53 rep)

Nov 29, 2018, 11:31 AM
Last activity: Nov 30, 2018, 05:57 PM

What is the meaning of "minimal key"?

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