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# AWS::QuickSight::DataSet AppendOperation
<a name="aws-properties-quicksight-dataset-appendoperation"></a>

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

## Syntax
<a name="aws-properties-quicksight-dataset-appendoperation-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-quicksight-dataset-appendoperation-syntax.json"></a>

```
{
  "[Alias](#cfn-quicksight-dataset-appendoperation-alias)" : String,
  "[AppendedColumns](#cfn-quicksight-dataset-appendoperation-appendedcolumns)" : [ AppendedColumn, ... ],
  "[FirstSource](#cfn-quicksight-dataset-appendoperation-firstsource)" : TransformOperationSource,
  "[SecondSource](#cfn-quicksight-dataset-appendoperation-secondsource)" : TransformOperationSource
}
```

### YAML
<a name="aws-properties-quicksight-dataset-appendoperation-syntax.yaml"></a>

```
  [Alias](#cfn-quicksight-dataset-appendoperation-alias): String
  [AppendedColumns](#cfn-quicksight-dataset-appendoperation-appendedcolumns): 
    - AppendedColumn
  [FirstSource](#cfn-quicksight-dataset-appendoperation-firstsource): 
    TransformOperationSource
  [SecondSource](#cfn-quicksight-dataset-appendoperation-secondsource): 
    TransformOperationSource
```

## Properties
<a name="aws-properties-quicksight-dataset-appendoperation-properties"></a>

`Alias`  <a name="cfn-quicksight-dataset-appendoperation-alias"></a>
Alias for this operation.  
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`AppendedColumns`  <a name="cfn-quicksight-dataset-appendoperation-appendedcolumns"></a>
The list of columns to include in the appended result, mapping columns from both sources.  
*Required*: Yes  
*Type*: Array of [AppendedColumn](aws-properties-quicksight-dataset-appendedcolumn.md)  
*Minimum*: `0`  
*Maximum*: `2048`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`FirstSource`  <a name="cfn-quicksight-dataset-appendoperation-firstsource"></a>
The first data source to be included in the append operation.  
*Required*: No  
*Type*: [TransformOperationSource](aws-properties-quicksight-dataset-transformoperationsource.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SecondSource`  <a name="cfn-quicksight-dataset-appendoperation-secondsource"></a>
The second data source to be appended to the first source.  
*Required*: No  
*Type*: [TransformOperationSource](aws-properties-quicksight-dataset-transformoperationsource.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)