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Relational schema

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Reference no: EM13992891

What would be the correct answer for them?

For questions x - y refer to the following relational schema:

Which of the following statements is true?

  1. (a)  a key is a superkey
  2. (b)  a candidate key is a superkey
  3. (c)  a primary key is a superkey
  4. (d)  all of the above

Reference no: EM13992891

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