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--Oct 09:13 AM mple of a rea

--Oct 09:13 AM mple of a rea

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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eneral Posts Files Reply Friday, October 15, 2021 Pounambal M 15-Oct 09:13 AM 1) Give an example of a realistic source of data for which the relational model doesn't work very well. Note that this question is about structuring data, not computing things. Thus, responses like "you can't compute n! in the relational model" or "you can't simulate a Turing machine" are not 2 appropriate answers. 2) Suppose we have a relation Employees(name, department, salary). For each of the following queries, either write the query in relational algebra and explain informally why your answer works, or explain why it cannot be written in relational algebra. You may use sequences of assignments or expression trees if you like. You may use only the following operators of relational algebra: union, intersection, difference, selection, projection, products, joins (theta and natural), renaming. a. Find all department(s) with at least two employees of different names. b. Find the department(s) with the most people. c. Find the names of employee(s) with the highest salary. See less e Reply
Transcribed Image Text:eneral Posts Files Reply Friday, October 15, 2021 Pounambal M 15-Oct 09:13 AM 1) Give an example of a realistic source of data for which the relational model doesn't work very well. Note that this question is about structuring data, not computing things. Thus, responses like "you can't compute n! in the relational model" or "you can't simulate a Turing machine" are not 2 appropriate answers. 2) Suppose we have a relation Employees(name, department, salary). For each of the following queries, either write the query in relational algebra and explain informally why your answer works, or explain why it cannot be written in relational algebra. You may use sequences of assignments or expression trees if you like. You may use only the following operators of relational algebra: union, intersection, difference, selection, projection, products, joins (theta and natural), renaming. a. Find all department(s) with at least two employees of different names. b. Find the department(s) with the most people. c. Find the names of employee(s) with the highest salary. See less e Reply
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