2.  Problems 2 is based on the following query:   SELECT EMP_LNAME, EMP_FNAME, EMP_DOB, YEAR(EMP_DOB) AS YEAR   FROM EMPLOYEE   WHERE YEAR(EMP_DOB) = 1966;     What is the likely data sparsity of the EMP_DOB column? Should you create an index on EMP_DOB? Why or why not?

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
Question
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2.  Problems 2 is based on the following query:

 

SELECT EMP_LNAME, EMP_FNAME, EMP_DOB, YEAR(EMP_DOB) AS YEAR

 

FROM

EMPLOYEE

 

WHERE

YEAR(EMP_DOB) = 1966;

 

 

  1. What is the likely data sparsity of the EMP_DOB column?
  2. Should you create an index on EMP_DOB? Why or why not?

 

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