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Data Analysis Using SQL and Excel

Data Analysis Using SQL and Excel - Second Edition

By : Gordon S. S. Linoff
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Data Analysis Using SQL and Excel

Data Analysis Using SQL and Excel

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)
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1
Foreword
17
EULA

Exploring String Values

String values pose particular challenges for data exploration because they can take on almost any value. This is particularly true for free-form strings, such as addresses and names, which may not be cleaned. This section looks at exploring the length and characters in strings.

Histogram of Length

A simple way to get familiar with string values is to do a histogram of the length of the values. What is the length of values in the City column in the Orders table?

SELECT LEN(City) as length, COUNT(*) as numorders, MIN(City), MAX(City)
FROM Orders o
GROUP BY LEN(City)
ORDER BY length

This query provides not only a histogram of the lengths, but also examples of two values—the minimum and maximum values for each length. For the City column, there are lengths from 0 to 20, which is the maximum length the column stores.

Strings Starting or Ending with Spaces

Spaces at the beginning of string values can cause unexpected problems. The value “ NY”...

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Data Analysis Using SQL and Excel
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