Data Mining Extensions - DMX - Reference

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Understanding the Select Statement (DMX) Unary Operators Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression. The following table identifies the unary operators that DMX supports. Operator Description Understanding the Select Statement (DMX) Returns the negative value of a numeric expression. + (Positive) (MDX) Returns the positive value of a numeric expression. See Also Data Mining Extensions (DMX) Reference DMX Function Reference DMX Operator Reference DMX Statement Reference DMX Syntax Conventions DMX Syntax Elements Expressions (DMX) Mapping Functions to Query Types (DMX) Operators (DMX) Prediction Queries (DMX) Understanding the Select Statement (DMX) Functions When you use Data Mining Extensions (DMX) to query objects in Microsoft SQL Server Analysis Services, you can use functions to return more information than just the values in the columns in the data mining model or input dataset. For example, you can use DMX queries to return not only the prediction value of a column, but also the probability that the prediction is correct. You can use not only DMX functions, but also functions from Microsoft Visual Basic for Applications (VBA), Microsoft Excel, and stored procedures. DMX Functions 27
You can use DMX functions to perform the following tasks: • Return predictions. • Return statistics about a prediction such as the probability and support. • Filter your query results. • Reorder a table expression. Most DMX functions return a scalar value, such as the support for a prediction, but some return a tabular result. For example, the PredictHistogram function returns a table that contains the support and probability for each state of the specified predictable column. The results are displayed as a new tabular column. For More Information: Understanding the Select Statement (DMX), DMX Function Reference Visual Basic for Applications (VBA) and Excel Functions In addition to DMX functions, you can also call a variety of VBA and Excel functions from DMX statements. For example, you can use the lCase function to modify how the Attribute_Name column in the TM_Decision_Tree model content is displayed. This is shown in the following code sample. SELECT lCase([Attribute_Name]) FROM [TM_Decision_Tree].CONTENT If the same function exists in both VBA and Excel, you must prefix the function name in your DMX statement with either VBA or Excel. For example, you would use VBA!Log or Excel!Log. If the VBA or Excel function that you want to use also exists in DMX or Multidimensional Expressions (MDX), or if the function contains a dollar sign character ($), you must use square brackets ([]) to escape the function. For example, the function call would be [VBA!Format]. Stored Procedures You can use common language runtime programming languages to create stored procedures that extend the functionality of DMX. For example, a regression tree mining model returns coefficients, such as , , and so on, that describe the regression equation, but the model does not return the equation itself, such as . However, you can write a stored procedure that uses the data mining model object to navigate the content schema, and to return the regression equation as an output. Therefore, a DMX statement can return a list of the regression equations as part of a query result. For More Information: Assemblies (Analysis Services) See Also Data Mining Extensions (DMX) Reference DMX Function Reference DMX Operator Reference DMX Statement Reference 28
Page 2 and 3: Data Mining Extensions (DMX) Refere
Page 4 and 5: Contents Data Mining Extensions (DM
Page 6 and 7: * (Multiply) ......................
Page 8 and 9: • Create a mining structure by us
Page 10 and 11: The type of query you use depends o
Page 12 and 13: Each of these tasks uses a differen
Page 14 and 15: Back to Select Types Drillthrough Y
Page 16 and 17: Query type Supported functions Rema
Page 18 and 19: Query type Supported functions Rema
Page 20 and 21: An object identifier is created whe
Page 22 and 23: Data types depend on the algorithm.
Page 24 and 25: You can use operators to combine sm
Page 26 and 27: Operator Description argument on th
Page 30 and 31: DMX Syntax Conventions DMX Syntax E
Page 32 and 33: DMX Syntax Elements Understanding t
Page 34 and 35: Columns that are left unspecified i
Page 36 and 37: Data Mining Extensions (DMX) Statem
Page 38 and 39: Statement DROP MINING MODEL (DMX) D
Page 40 and 41: • Relationship to an attribute co
Page 42 and 43: ) Example 2: Specifying Holdout Per
Page 44 and 45: parameter list Optional. A comma-se
Page 46 and 47: Filter Criteria Expressions You can
Page 48 and 49: [Model] = 'ML Road Tire' ) ) ) WITH
Page 50 and 51: For a list of the data types, conte
Page 52 and 53: [Model] TEXT DISCRETE PREDICT ) ) U
Page 54 and 55: object name Optional. The name of t
Page 56 and 57: parameter list Optional. A comma-se
Page 58 and 59: Arguments model A model identifier.
Page 60 and 61: If you use INSERT INTO with a minin
Page 62 and 63: ) SHAPE { OPENQUERY([AdventureWorks
Page 64 and 65: • SELECT FROM PREDICTION JOIN •
Page 66 and 67: Example results: Gender F M For col
Page 68 and 69: SELECT FROM .CONTENT Returns the mi
Page 70 and 71: Examples The following code returns
Page 72 and 73: DMX Data Manipulation Statements DM
Page 74 and 75: Not all mining model types support
Page 76 and 77: Remarks Algorithm providers define
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query to columns in the mining mode
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[HouseOwnerFlag], [NumberCarsOwned]
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expression list n A comma-separated
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Example 1: Drill through to Structu
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query syntax A query syntax that re
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... RELATE TO ) AS < column table
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esults of the prediction are return
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Function RangeMax RangeMid RangeMin
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Model $SUPPORT $PROBABILITY $ADJUST
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A column in the nested table, or ex
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example uses $SUPPORT because suppo
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Examples The following example uses
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'Graduate Degree' AS [Education], 0
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For more information about using th
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A Boolean type. Remarks IsDescendan
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Functions (DMX) Querying Data Minin
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Predict(, [option1], [option2], [op
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Syntax PredictAdjustedProbability(,
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See Also Mapping Functions to Query
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PredictHistogram( | ) Applies To A
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Return Type Examples The following
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Bike Buyer Bike Buyer = Yes Bike Bu
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PredictSupport Returns the support
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n-start, n-end Specifies a range of
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this query returns two columns. The
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WHERE ([Model Region] = 'M200 Europ
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Model Region Europe M200 Europe M20
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Scalar columns. Return Type A scala
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Scalar columns. Return Type A scala
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We will use the following mining st
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product name, but also returns the
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Applies To An expression that retur
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The third argument to the TopPercen
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Operator Description argument or bo
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+ (Add) Performs an arithmetic oper
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Operators (DMX) Data Mining Extensi
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Return Value A Boolean value that c
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Return Value A Boolean value that c
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NOT A logical operator that perform
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Syntax + Numeric_Expression Paramet
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-- Comment_Text Parameters Paramete
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Convention Usage syntax that can be
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