# JoinColumn
<a name="API_JoinColumn"></a>

Specifies a column to be joined.

## Contents
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 ** From **   <a name="Glue-Type-JoinColumn-From"></a>
The column to be joined.  
Type: String  
Pattern: `([\u0009\u000B\u000C\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF])*`   
Required: Yes

 ** Keys **   <a name="Glue-Type-JoinColumn-Keys"></a>
The key of the column to be joined.  
Type: Array of arrays of strings  
Pattern: `([\u0009\u000B\u000C\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF])*`   
Required: Yes

## 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\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/glue-2017-03-31/JoinColumn) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/glue-2017-03-31/JoinColumn) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/glue-2017-03-31/JoinColumn) 

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for AWS Glue. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query glue` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).