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Answer the following.

  1. Which of the following are not keys in the database?
  1. Compliment *
  2. Agreement
  3. Construct
  4. Supplement

1 Answer

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  • Primary Key → uniquely identifies each row.

  • Candidate Key → a minimal unique key.

  • Super Key → any key that can uniquely identify a row (may have extra attributes).

  • Foreign Key → references a primary key in another table.

  • Composite Key → a key made of multiple attributes.

Anything outside these standard definitions is not considered a key in DBMS.

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