Computer Science
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Best UK USA UAE Australia Canada China Building Database Assignment Help Service Online You are building a database for MovieRewind. MovieRewind buys the rights to distribute movies from copyright owners, and then makes a profit by manfucturing and selling DVD copies of the movies through the postal service. Your 1st task will be […]
Best UK USA UAE Australia Canada China SQL Query Assignment Help Service Online Consider a relation with this schema: Employees(eid: integer, ename: string, sal: integer, title: string, age: integer) Suppose that the following indexes, all using Alternative (2) for data entries, exist: a hash index on eid, a B+ tree index on […]
Best UK USA UAE Australia Canada China SQL Index Assignment Help Service Online You are given the following information: Executives has attributes ename, title, dname, and address; all are string fields of the same length. The ename attribute is a candidate key. The relation contains 10,000 pages. There are 10 buffer pages. […]
Best UK USA UAE Australia Canada China SQL Projection Query Assignment Help Service Online Consider processing the following SQL projection query SELECT DISTINCT E.title, E.ename FROM Executives E You are given the following information Executives has attributes ename, title, dname, and address; all are string fields of the same length. The […]
Best UK USA UAE Australia Canada China SQL Schema Assignment Help Service Online 1.Consider the following Schema: Suppliers (sid : integer, sname: string, address: string) Parts (pid : integer, pname: string, color: string) Catalog (sid : integer; pid : integer, cost: real) The key fields are underlined. The catalog relation lists the […]
Best UK USA UAE Australia Canada China Online SQL Homework Help Service Online 1. Describe a situation in which projection should precede selection in processing a project-select query, and describe a situation where the opposite processing order is better. (Assume that duplicate elimination for projection is done via sorting.) 2. If there are […]
Best UK USA UAE Australia Canada China Query Optimization Assignment Help Service Online 1.What role do statistics gathered from the database play in query optimization? 2. What were the important design decisions made in the System R optimizer? 3.Why do query optimizers consider only left-deep join trees? Give an example of a […]
Best UK USA UAE Australia Canada China Online SQL Assignment Help Service Online 1.What is an access path? When does an index match an access path? 2.What is a primary conjunct, and why is it important? 3. What information is stored in the system catalogs? How it Works? Step 1:- […]
Best UK USA UAE Australia Canada China SQL Query Optimization Assignment Help Service Online 1.What is an unsafe query? Give an example and explain why it is important to disallow such queries. 2.What is the goal of query optimization? Why is it important? 3.Describe pipelining and its advantages. How it […]