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

A transform operation that projects columns. Operations that come after a projection can only refer to projected columns.

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

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

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

```
{
  "[Alias](#cfn-quicksight-dataset-projectoperation-alias)" : String,
  "[ProjectedColumns](#cfn-quicksight-dataset-projectoperation-projectedcolumns)" : [ String, ... ],
  "[Source](#cfn-quicksight-dataset-projectoperation-source)" : TransformOperationSource
}
```

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

```
  [Alias](#cfn-quicksight-dataset-projectoperation-alias): String
  [ProjectedColumns](#cfn-quicksight-dataset-projectoperation-projectedcolumns): 
    - String
  [Source](#cfn-quicksight-dataset-projectoperation-source): 
    TransformOperationSource
```

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

`Alias`  <a name="cfn-quicksight-dataset-projectoperation-alias"></a>
Alias for this operation.  
*Required*: No  
*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)

`ProjectedColumns`  <a name="cfn-quicksight-dataset-projectoperation-projectedcolumns"></a>
Projected columns.  
*Required*: No  
*Type*: Array of String  
*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)

`Source`  <a name="cfn-quicksight-dataset-projectoperation-source"></a>
The source transform operation that provides input data for column projection.  
*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)