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Computer Engineering
Dept(did, dname, location, managerid) Emp(eid, sal) You are told that the following queries are extremely important: List the names and ids of managers for each department in a user-specified loca- tion, in alphabetical order by department name. Find the average salary of employees who manage departments in a user-specified location. You can assume that no one manages more than one department.

Dept(did, dname, location, managerid) Emp(eid, sal) You are told that the following queries are extremely important: List the names and ids of managers for each department in a user-specified loca- tion, in alphabetical order by department name. Find the average salary of employees who manage departments in a user-specified location. You can assume that no one manages more than one department.

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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Dept(did, dname, location, managerid) Emp(eid, sal) You are told that the following queries are extremely important: List the names and ids of managers for each department in a user-specified loca- tion, in alphabetical order by department name. Find the average salary of employees who manage departments in a user-specified location. You can assume that no one manages more than one department. 1. Describe the file structures and indexes that you would choose. 2. You subsequently realize that updates to these relations are frequent. Because indexes incur a high overhead, can you think of a way to improve performance on these queries without using indexes?
Transcribed Image Text:Dept(did, dname, location, managerid) Emp(eid, sal) You are told that the following queries are extremely important: List the names and ids of managers for each department in a user-specified loca- tion, in alphabetical order by department name. Find the average salary of employees who manage departments in a user-specified location. You can assume that no one manages more than one department. 1. Describe the file structures and indexes that you would choose. 2. You subsequently realize that updates to these relations are frequent. Because indexes incur a high overhead, can you think of a way to improve performance on these queries without using indexes?
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