Question: Given a relation S student subject marks write a query
Given a relation S (student, subject, marks), write a query to find the top n students by total marks, by using ranking.
Answer to relevant QuestionsGiven 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, ...Suppose half of all the transactions in a clothes shop purchase jeans, and one third of all transactions in the shop purchase T-shirts. Suppose also that half of the transactions that purchase jeans also purchase T-shirts. ...What are the two types of time, and how are they different? Why does it make sense to have both types of time associated with a tuple?Describe how the ideas behind the RAID organization (Section 11.3) can be used in a broadcast-data environment, where there may occasionally be noise that prevents reception of part of the data being transmitted.Consider a main-memory database system recovering from a system crash. Explain the relative merits of• Loading the entire database back into main memory before resuming transaction processing• Loading data as it is ...
Post your question