Book Image

Data Analysis Using SQL and Excel - Second Edition

By : Gordon S. S. Linoff
Book Image

Data Analysis Using SQL and Excel - Second Edition

By: Gordon S. S. Linoff

Overview of this book

Data Analysis Using SQL and Excel, 2nd Edition shows you how to leverage the two most popular tools for data query and analysis—SQL and Excel—to perform sophisticated data analysis without the need for complex and expensive data mining tools. Written by a leading expert on business data mining, this book shows you how to extract useful business information from relational databases. You'll learn the fundamental techniques before moving into the "where" and "why" of each analysis, and then learn how to design and perform these analyses using SQL and Excel. Examples include SQL and Excel code, and the appendix shows how non-standard constructs are implemented in other major databases, including Oracle and IBM DB2/UDB. The companion website includes datasets and Excel spreadsheets, and the book provides hints, warnings, and technical asides to help you every step of the way. Data Analysis Using SQL and Excel, 2nd Edition shows you how to perform a wide range of sophisticated analyses using these simple tools, sparing you the significant expense of proprietary data mining tools like SAS.
Table of Contents (18 chapters)
Free Chapter
1
Foreword
17
EULA

String Functions

This section includes functions that operate on string values.

Searching for Position of One String within Another

Which function searches for one string inside another string? The arguments are:

  • <search string>: The string to be searched
  • <pattern>: The string to look for
  • <occurrence>: Which occurrence
  • <offset>: Where to start searching

IBM DB2

LOCATE(<pattern>, <search string>, <offset>)

The argument <offset> is optional and defaults to 1. The function returns the position in the search string where the pattern is found and 0 if the pattern is not found.

An alternative method:

POSSTR(<search string>, <pattern>)

The function returns the position in the search string where the pattern is found and 0 if the pattern is not found.

MySQL

INSTR(<search string>, <pattern>)

The function returns the position in the search string where the pattern is found and 0 if the pattern is not found.

An alternative...