# JoinKeyProperties
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Properties associated with the columns participating in a join.

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

 ** UniqueKey **   <a name="QS-Type-JoinKeyProperties-UniqueKey"></a>
A value that indicates that a row in a table is uniquely identified by the columns in a join key. This is used by Quick Sight to optimize query performance.  
Type: Boolean  
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/JoinKeyProperties) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/JoinKeyProperties) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/JoinKeyProperties)