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If P and Q are predicates and P is the relational algebra expression, then which of the following equivalences are valid ?

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Q.

If P and Q are predicates and P is the relational algebra expression, then which of the following equivalences are valid ?

[A] σ_P(σ_Q(e))=σ_Q(σ_P(e))

[B] σ_P(σ_Q(e))=σ_Q(e)

[C] nσ_Q(σ_P(e))=σ_Q(σ_P(e))

[D] none of these

Answer & Explanation
Option: [D]

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