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MCQ 26: Composition of relational-algebra operations to relational-algebra expressions is similar to composition of:

  1. Arithmetic operations
  2. Geometric operations
  3. Logarithmic operations
  4. Boolean operations

MCQ 27: The generated outputs of relational-algebra expressions do not have identities, which is used for:

  1. Reference
  2. Comparison
  3. Validate
  4. Retrieval

MCQ 28: Complete information of the right relation is displayed in the result of the:

  1. Full outer join
  2. Natural outer join
  3. Right outer join
  4. Left outer join

MCQ 29: The Greek letter that is used for denotion of selection is:

  1. alpha
  2. beta
  3. gamma
  4. sigma

MCQ 30: The theta join operation is a variant of the:

  1. Natural join
  2. Compound join
  3. Composite join
  4. Assignment join

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