# QueryConstraint
<a name="API_QueryConstraint"></a>

Provides any necessary query constraint information.

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

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** requireOverlap **   <a name="API-Type-QueryConstraint-requireOverlap"></a>
An array of column names that specifies which columns are required in the JOIN statement.  
Type: [QueryConstraintRequireOverlap](API_QueryConstraintRequireOverlap.md) object  
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/cleanrooms-2022-02-17/QueryConstraint) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cleanrooms-2022-02-17/QueryConstraint) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cleanrooms-2022-02-17/QueryConstraint)