# TopicNullFilter
<a name="API_TopicNullFilter"></a>

The structure that represents a null filter.

## Contents
<a name="API_TopicNullFilter_Contents"></a>

**Note**  
In the following list, the required parameters are described first.

 ** Constant **   <a name="QS-Type-TopicNullFilter-Constant"></a>
A structure that represents a singular filter constant, used in filters to specify a single value to match against.  
Type: [TopicSingularFilterConstant](API_TopicSingularFilterConstant.md) object  
Required: No

 ** Inverse **   <a name="QS-Type-TopicNullFilter-Inverse"></a>
A Boolean value that indicates if the filter is inverse.  
Type: Boolean  
Required: No

 ** NullFilterType **   <a name="QS-Type-TopicNullFilter-NullFilterType"></a>
The type of the null filter. Valid values for this type are `NULLS_ONLY`, `NON_NULLS_ONLY`, and `ALL_VALUES`.  
Type: String  
Valid Values: `ALL_VALUES | NON_NULLS_ONLY | NULLS_ONLY`   
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/quicksight-2018-04-01/TopicNullFilter) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/TopicNullFilter) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/TopicNullFilter)