Show how to express group by cube (a, b, c, d) using rollup; your answer should have only one group by clause.
Answer to relevant QuestionsGive an example of a pair of groupings that cannot be expressed by using a single group by clause with cube and rollup.Consider the sales relation from Section 22.2. Write an SQL query to compute the cube operation on the relation, giving the relation in as shown below. Do not use the with cubeconstruct.What is the difference between a false positive and a false drop? If it is essential that no relevant information be missed by an information retrieval query, is it acceptable to have either false positives or false drops? ...Give a recursive procedure to efficiently compute the spatial join of two relations with R-tree indices. Like database systems, workflow systems also require concurrency and recovery management. List three reasons why we cannot simply apply a relational database system using 2PL, physical undo logging, and 2PC.
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