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Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900

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Chapter
Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900
Chapter 11, Problem 2P
Textbook Problem
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Problem 1 and 2 are based on the following query:

SELECT EMP_LNAME, EMP_FNAME, EMP_AREACODE, EMP_SEX
FROM EMPLOYEE
WHERE EMP_SEX = 'F' AND EMP_AREACODE = '615'
ORDER BY EMP_LNAME, EMP_FNAME;

What indexes should you create? Write the required SQL commands.

Program Plan Intro

Indexes:

  • Indexing is a technique that is used in SQL for optimizing the performance.
  • Indexes are used when a small set of rows needs to be selected from the table that is large in size.
  • The selection of rows is made by specifying conditions.

Rules for using indexes:

The below are the rules how the indexes can be used:

  • When an indexed column appears within in the search criteria of “WHERE” or “HAVING” clause.
  • When an indexed column appears within in “GROUP BY” or “ORDER BY” clause.
  • When the indexed column is applied with functions MAX and MIN.
  • When the indexed column’s data sparsity is high.

Syntax for creating INDEX:

The below mentioned is the syntax for creating the index:

CREATE [UNIQUE] INDEX indexname ON tablename(column1 [, column2])

Explanation of Solution

Index that required to be created:

The indexes that can be created for the given query are:

  • Creating an index for the attribute “EMP_AREACODE”.
  • Creating a composite index for the attributes “EMP_LNAME” and “EMP_FNAME”.

Creation of the SQL commands:

The index for the given query is generated with the following names “EMP_MYNDX1” and “EMP_MYNDX2”.

The commands are as follows:

Index creation for the attribute “EMP_AREACODE”:

CREATE I...

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Chapter 11 Solutions

Database Systems: Design, Implementation, & Management
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Ch. 11 - What are optimizer hints, and how are they used?Ch. 11 - What are some general guidelines for creating and...Ch. 11 - Most query optimization techniques are designed to...Ch. 11 - What recommendations would you make for managing...Ch. 11 - What does RAID stand for, and what are some...Ch. 11 - SELECT SELECT EMP_LNAME, EMP_FNAME, EMP_AREACODE,...Ch. 11 - Problem 1 and 2 are based on the following query:...Ch. 11 - Using Table 11.4 as an example, create two...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 46 are based on the following query:...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 732 are based on the ER model shown in...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 1114 are based on the following query:...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 15 and 16 are based on the following...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - Problems 1721 are based on the following query:...Ch. 11 - SELECT SELECT P_CODE, P_DESCRIPT, P_PRICE,...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 2224 are based on the following query:...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Problems 25 and 26 are based on the following...Ch. 11 - Problems 27 and 28 are based on the following...Ch. 11 - Problems 27 and 28 are based on the following...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...Ch. 11 - Problems 2932 are based on the following query:...

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