Question: Given relation r a b d d Show how to
Given relation r (a, b, d, d), Show how to use the extended SQL features to generate a histogram of d versus a, dividing a into 20 equal-sized partitions (thatis, where each partition contains 5 percent of the tuples in r, sorted by a).
Answer to relevant QuestionsWrite a query to find cumulative balances, equivalent to that shown in Section 22.2.5, but without using the extended SQL windowing constructs.Consider the problem of finding large itemsets.a. Describe how to find the support for a given collection of itemsets by using a single scan of the data. Assume that the itemsets and associated information, such as counts, ...Will functional dependencies be preserved if a relation is converted to a temporal relation by adding a time attribute? How is the problem handled in a temporal database?List three main features of mobile computing over wireless networks that are distinct from traditional distributed systems.In the group-commit technique, how many transactions should be part of a group? Explain your answer.
Post your question