Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Indicates whether a case is used as a test case for the specified data mining model or mining structure.
If you use the Data Mining Wizard to create a mining structure and related mining model, by default, 30 percent of the cases are set aside for use as a test data set. The remaining cases are used for training the data mining model. The same test data set can be used with all models that are based on that structure. However, if you use DMX to create the mining model, by default, all data is used to train the model, and no test set is created. To enable creation of a test data set, you must set the parameters of the WITH HOLDOUT clause.
Drillthrough must be enabled on the model if you want to use the IsTrainingCase or IsTestCase functions to return details about the cases in a particular model. For more information, see Enable Drillthrough for a Mining Model.
To return cases that are part of the training data set, use the function IsTrainingCase (DMX).
The following example uses the Targeted Mailing mining structure that is created in the Basic Data Mining Tutorial. The query returns all the cases in the structure that are used for testing.
SELECT * FROM [Targeted Mailing].CASES WHERE IsTestCase()