Emp (Eno, Ename, Title, City) Project(Pno, Pname, Budget, City) Works(Eno, Pno, Resp, Dur) SELECT Ename, Pname FROM Emp e, Works w, Project p WHERE e.Eno = w.Eno AND e.city = p.Eno AND p.city = Newark AND w.Dur > 40 Given the database schema and the query above and knowing that only 1% of the employees work on a project for 40 months or more, propose an optimized query plan and discuss the indexes needed
Emp (Eno, Ename, Title, City) Project(Pno, Pname, Budget, City) Works(Eno, Pno, Resp, Dur) SELECT Ename, Pname FROM Emp e, Works w, Project p WHERE e.Eno = w.Eno AND e.city = p.Eno AND p.city = Newark AND w.Dur > 40 Given the database schema and the query above and knowing that only 1% of the employees work on a project for 40 months or more, propose an optimized query plan and discuss the indexes needed
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter9: Database Design
Section: Chapter Questions
Problem 5P
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Emp (Eno, Ename, Title, City)
Project(Pno, Pname, Budget, City)
Works(Eno, Pno, Resp, Dur)
SELECT Ename, Pname
FROM Emp e, Works w, Project p
WHERE e.Eno = w.Eno
AND e.city = p.Eno
AND p.city = Newark
AND w.Dur > 40
Given the
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