# AppendOperation
<a name="API_AppendOperation"></a>

A transform operation that combines rows from two data sources by stacking them vertically (union operation).

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

 ** Alias **   <a name="QS-Type-AppendOperation-Alias"></a>
Alias for this operation.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 64.  
Required: Yes

 ** AppendedColumns **   <a name="QS-Type-AppendOperation-AppendedColumns"></a>
The list of columns to include in the appended result, mapping columns from both sources.  
Type: Array of [AppendedColumn](API_AppendedColumn.md) objects  
Array Members: Minimum number of 0 items. Maximum number of 2048 items.  
Required: Yes

 ** FirstSource **   <a name="QS-Type-AppendOperation-FirstSource"></a>
The first data source to be included in the append operation.  
Type: [TransformOperationSource](API_TransformOperationSource.md) object  
Required: No

 ** SecondSource **   <a name="QS-Type-AppendOperation-SecondSource"></a>
The second data source to be appended to the first source.  
Type: [TransformOperationSource](API_TransformOperationSource.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/quicksight-2018-04-01/AppendOperation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/AppendOperation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/AppendOperation)