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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 11, Problem 12P
Textbook Problem
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Problems 11–14 are based on the following query:

SELECT P_CODE, SUM(LINE_UNITS)
FROM LINE
GROUP BY P_CODE
HAVING SUM(LINE_UNITS) > (SELECT MAX(LINE_UNITS) FROM LINE);

Should you create an index? If so, what would the index column(s) be, and why would you create the index? If not, explain your reasoning.

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 itself in the search criteria of “WHERE” or “HAVING” clause.
  • When an indexed column appears within itself 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.

Explanation of Solution

Creating an index:

Yes, it is necessary to create an index for the given query.

Column that needs to be indexed:

The column “LINE_UNITS” will be the column that needs to be indexed...

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Chapter 11 Solutions

Database Systems: Design, Implementation, & Management
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