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Consider a relation s over the attributes A and B with the following characteristics:
(a) Assuming that the aforesaid index on A is unclustered, estimate the number of disk accesses needed to compute the range query σA>1000 ^ A<6000 (s).
(b) What would be the cost if the above index were clustered? Explain your reasoning.
what is bogus empowerment. And what is genuine empowerment
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What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
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