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

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 Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter11: Database Performance Tuning And Query Optimization
Section: Chapter Questions
Problem 2P: Problem 1 and 2 are based on the following query: SELECT EMP_LNAME, EMP_FNAME, EMP_AREACODE, EMP_SEX...
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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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