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Database Systems: Design, Implemen...

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

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Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 11, Problem 28P
Textbook Problem
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Problems 27 and 28 are based on the following query:

SELECT P_CODE, P_DESCRIPT, P_QOH, P_PRICE, V_CODE
FROM PRODUCT
WHERE P_QOH < P_MIN
  AND P_MIN = P_REORDER
  AND P_REORDER = 50
ORDER BY P_QOH;

What indexes would you recommend? Write the commands to create those indexes.

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.

Syntax for creating INDEX:

The below mentioned is the syntax for creating the index:

CREATE [UNIQUE]INDEXindexname ON tablename(column1 [, column2])

Explanation of Solution

Index that are recommended:

  • The given query uses equality comparison on the columns P_REORDER, P_MIN and P_QOH.
  • The indexes that are to be created for the below mentioned attributes:
    • Index on the attribute P_REORDER.
    • Index on the attribute P_MIN.
    • Index on the attribute P_QOH.

Creation of the SQL commands:

The index for the given query is generated with the following names “PRO_MYNDX1”  “PRO_MYNDX2” and “PRO_MYINDX3”...

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Chapter 11 Solutions

Database Systems: Design, Implementation, & Management
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