Market Basket DMX Tutorial
In this tutorial, you will learn how to create, train, and explore mining models by using the Data Mining Extensions (DMX) query language. You will then use these mining models to create predictions that describe which products tend to be purchased at the same time.
The mining models will be created from the data contained in the AdventureWorksDW sample database, which stores data for the fictitious company Adventure Works Cycles. Adventure Works Cycles is a large, multinational manufacturing company. The company manufactures and sells metal and composite bicycles to North American, European, and Asian commercial markets. Its base operation is located in Bothell, Washington, with 290 employees, and it has several regional sales teams are located throughout their international market base. For more information about the AdventureWorksDW sample database, see AdventureWorks Sample Data Warehouse.
Adventure Works Cycles has decided to create a custom application that employs data mining functionality to predict what types of products their customers tend to purchase at the same time. The goal for the custom application is to be able to specify a set of products, and predict what additional products will be purchased with the specified products. Adventure Works Cycles will then use this information to add a suggest feature to their website, and also to better organize the way that they present information to their customers.
Microsoft SQL Server 2005 Analysis Services (SSAS) provides several tools that can be used to accomplish this task:
The DMX query language
The Microsoft Association Algorithm
Query Editor in SQL Server Management Studio
Data Mining Extensions (DMX) is a query language provided by Analysis Services that you can use to create and work with mining models. The Microsoft Association algorithm creates models that can predict the products that are likely to be purchased together.
The goal of this tutorial is to provide the DMX queries that will be used in the custom application.
For more information: Working with Data Mining
Before you begin to create DMX statements, it is important to understand the main objects that Analysis Services uses to create mining models. The mining structure is a data structure that defines the data domain from which mining models are built. A single mining structure can contain multiple mining models that share the same domain. A mining model applies a mining model algorithm to the data, which is represented by a mining structure.
The building blocks of the mining structure are the mining structure columns, which describe the data that the data source contains. These columns contain information such as data type, content type, and how the data is distributed.
Mining models must contain the key column described in the mining structure, as well as a subset of the remaining columns. The mining model defines the usage for each column and defines the algorithm that is used to create the mining model. For example, in DMX you can specify that a column is a Key column or a PREDICT column. If a column is left unspecified, it is assumed to be an input column.
In DMX, there are two ways to create mining models. You can either create the mining structure and associated mining model together by using the CREATE MINING MODEL statement, or you can first create a mining structure by using the CREATE MINING STRUCTURE statement, and then add a mining model to the structure by using the ALTER STRUCTURE statement. These methods are described below.
- CREATE MINING MODEL
Use this statement to create a mining structure and associated mining model together using the same name. The mining model name is appended with "Structure" to differentiate it from the mining structure. This statement is useful if you are creating a mining structure that will contain a single mining model.
For more information, see CREATE MINING MODEL (DMX).
- ALTER MINING STRUCTURE
Use this statement to add a mining model to a mining structure that already exists on the server. This statement is useful if you want to create a mining structure that contains several different mining models. There are several reasons that you would want to add more than one mining model in a single mining structure. For example, you may create several mining models using different algorithms to see which one works best. You may create several mining models using the same algorithm, but with a parameter set differently for each mining model to find the best setting for the parameter.
For more information, see ALTER MINING STRUCTURE (DMX).
Because you will create a mining structure that contains several mining models, you will use the second method in this tutorial.
For More Information
This tutorial is divided into the following lessons:
- Lesson 1: Creating the Market Basket Mining Structure
In this lesson, you will learn how to use the CREATE statement to create mining structures.
- Lesson 2: Adding Mining Models to the Market Basket Mining Structure
In this lesson, you will learn how to use the ALTER statement to add mining models to a mining structure.
- Lesson 3: Processing the Market Basket Mining Structure
In this lesson you will learn how to use the INSERT INTO statement to process mining structures and their associated mining models.
- Lesson 4: Executing Market Basket Predictions
In this lesson, you will learn how to use the PREDICTION JOIN statement to create predictions against mining models.
Before doing this tutorial, make sure that the following are installed:
Microsoft SQL Server 2005
Microsoft SQL Server 2005 Analysis Services (SSAS)
The AdventureWorks database, which is included with SQL Server 2005. By default, the sample databases are not installed, to enhance security. For more information about installing the sample databases, see Running Setup to Install AdventureWorks Sample Databases and Samples.
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