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Let R(A1,A2,A3,A4) be the schema of a relation R, and let C1,...,C4 be conditions on A1,...,A4. Does the Relational Algebra expression oC1 (oC2 (oC3
Let R(A1,A2,A3,A4) be the schema of a relation R, and let C1,...,C4 be conditions on A1,...,A4. Does the Relational Algebra expression oC1 (oC2 (oC3 (C4 (R)))), in general, yield the same result as the Relational Algebra expression oC4 (C3 (C2 (C1 (R))))? If yes, provide a formal mathematical argumentation. If not, argue why not. If your answer is no, are there any restrictions that could make the statement true? If so, what are these restrictions in mathematical notation? Let R(A1,A2,A3,A4) be the schema of a relation R, and let C1,...,C4 be conditions on A1,...,A4. Does the Relational Algebra expression oC1 (oC2 (oC3 (C4 (R)))), in general, yield the same result as the Relational Algebra expression oC4 (C3 (C2 (C1 (R))))? If yes, provide a formal mathematical argumentation. If not, argue why not. If your answer is no, are there any restrictions that could make the statement true? If so, what are these restrictions in mathematical notation?
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Database management systems
Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff
3rd edition
72465638, 978-0072465631
