Answered: Map it to a query tree Provide a…

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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Question

For the following query:
Map it to a query tree
Provide a simplified WHERE clause
Map a query with simplified WHERE clause in the above 2) to a query tree
SELECT ENAME, PNAME
FROM EMP, ASG, PROJ
WHERE (DUR > 12 OR RESP = "Analyst") AND
EMP.ENO = ASG.ENO AND
(TITLE = "Elect. Eng."OR ASG.PNO < "P3") AND
(DUR > 12 OR RESP NOT= "Analyst") AND
ASG.PNO = PROJ.PNO

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