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Database Systems: Design, Implemen...

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

Database Systems: Design, Implemen...

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

Solutions

Chapter
Section
Chapter 11, Problem 31P
Textbook Problem

Problems 29–32 are based on the following query:

SELECT CUS_CODE, MAX(LINE_UNITS*LINE_PRICE)
FROM CUSTOMER NATURAL JOIN INVOICE NATURAL JOIN LINE
WHERE CUS_AREACODE = '615'
GROUP BY CUS_CODE;

What indexes would you recommend for the query you wrote in Problem 30, and what SQL commands would you use?

Expert Solution
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]INDEX indexname ON tablename(column1 [, column2])

Explanation of Solution

The query of problem 29:

SELECT CUS_CODE, MAX(LINE_TOTAL)

FROM CUSTOMER NATURAL JOIN INVOICE NATURAL JOIN LINE

WHERE CUS_AREACODE = ‘615’

GROUP BY CUS_CODE;

Index that is recommended for the query:

  • Creating an index on “CUS_AREACODE” and an index on “CUS_CODE” the query will be greatly benefited.
  • Considering the column “CUS_CODE”, which is foreign key on invoice hence it seems to be an index that already exists...

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Chapter 11 Solutions

Database Systems: Design, Implementation, & Management
Show all chapter solutions
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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