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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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Question
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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