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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

Two-Way Associations

The calculation for two-way association rules follows the same logic as for the one-way rules. This section looks at the SQL for generating such rules, as well as some interesting extensions by extending the idea of item and the relationships among them.

Calculating Two-Way Associations

The basic query for calculating two-way associations is quite similar to the query for one-way associations. The difference is that the left-hand side has two products rather than one.

The following two rules are equivalent:

  • A and B➢C
  • B and A➢C

Hence, the products on the left-hand side are an item set, so the products should not be repeated.

This query implements this by requiring that the first product ID be smaller than the second on the left-hand side. The left- and right-hand sides of the rule are different, so each needs its own CTE:

WITH items as (
      SELECT ol.OrderId as basket, p.ProductId as item,
             COUNT(*) OVER (PARTITION BY p.ProductId) as...
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Data Analysis Using SQL and Excel
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