Question: Show how to derive the following equivalences by a sequence of transformations using the equivalence rules in Section 14.3.1. a. 1 2

Show how to derive the following equivalences by a sequence of transformations using the equivalence rules in Section 14.3.1.

a. σθ1 ∧ θ2 ∧ θ3 (E) = σθ1 (σθ2 (σθ3 (E)))

b. σθ1 ∧ θ2(E1 1θ3 E2) = σθ1 (E1 1θ3 (σθ2 (E2))), where θ2 involves only attributes from E2

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