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Database Systems: Design, Implemen...

11th Edition
Steven + 8 others
Publisher: Cengage Learning
ISBN: 9781285196145

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Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

11th Edition
Steven + 8 others
Publisher: Cengage Learning
ISBN: 9781285196145
Chapter 11, Problem 13P
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 on P_CODE? If so, write the SQL command to 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.

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

Creating an index:

Yes, it is necessary to create an index for the column “P_CODE”.

Reason:

The reason for creating index for the column “P_CODE” will aid in executing the query properly.

  • Most of the database create index automatically for the foreign key columns.
  • The index can also be manually created using the query...

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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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