Consider the following relational schema, and answer the following questions by writing relational algebra queries: Employee (EmpID, City, Zipcode) Works (EmpID, CorpID, Salary) Corporation (CorpID, City) Manages (EmpID, MngrID) a. Find the ID and City of all employees who work for Amawig. b. Find the ID and City of all employees who work for Amawig corporation and earn more than $100,000. c. Find the IDs of all employees who live in the same city as the corporation for which they work. d. Find the ID of all employees who live in the same area (zipcode) as do their managers. e. Find the IDs of all employees who earn more than every employee in the Amawig Corporation. f. Suppose that the corporations may have more than a branch in different cities. Find all corporations located in every city in which Amawig Corporation is located.
Consider the following relational schema, and answer the following questions by writing relational algebra queries: Employee (EmpID, City, Zipcode) Works (EmpID, CorpID, Salary) Corporation (CorpID, City) Manages (EmpID, MngrID) a. Find the ID and City of all employees who work for Amawig. b. Find the ID and City of all employees who work for Amawig corporation and earn more than $100,000. c. Find the IDs of all employees who live in the same city as the corporation for which they work. d. Find the ID of all employees who live in the same area (zipcode) as do their managers. e. Find the IDs of all employees who earn more than every employee in the Amawig Corporation. f. Suppose that the corporations may have more than a branch in different cities. Find all corporations located in every city in which Amawig Corporation is located.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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- Consider the following relational schema, and answer the following questions by writing relational algebra queries:
Employee (EmpID, City, Zipcode)
Works (EmpID, CorpID, Salary)
Corporation (CorpID, City)
Manages (EmpID, MngrID)
a. Find the ID and City of all employees who work for Amawig.
b. Find the ID and City of all employees who work for Amawig corporation and earn more than $100,000.
c. Find the IDs of all employees who live in the same city as the corporation for which they work.
d. Find the ID of all employees who live in the same area (zipcode) as do their managers.
e. Find the IDs of all employees who earn more than every employee in the Amawig Corporation.
f. Suppose that the corporations may have more than a branch in different cities. Find all corporations located in every city in which Amawig Corporation is located.
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