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

The lookback window setup of an incremental refresh configuration.

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

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

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

```
{
  "[ColumnName](#cfn-quicksight-dataset-lookbackwindow-columnname)" : String,
  "[Size](#cfn-quicksight-dataset-lookbackwindow-size)" : Number,
  "[SizeUnit](#cfn-quicksight-dataset-lookbackwindow-sizeunit)" : String
}
```

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

```
  [ColumnName](#cfn-quicksight-dataset-lookbackwindow-columnname): String
  [Size](#cfn-quicksight-dataset-lookbackwindow-size): Number
  [SizeUnit](#cfn-quicksight-dataset-lookbackwindow-sizeunit): String
```

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

`ColumnName`  <a name="cfn-quicksight-dataset-lookbackwindow-columnname"></a>
The name of the lookback window column.  
*Required*: Yes  
*Type*: String  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Size`  <a name="cfn-quicksight-dataset-lookbackwindow-size"></a>
The lookback window column size.  
*Required*: Yes  
*Type*: Number  
*Minimum*: `1`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SizeUnit`  <a name="cfn-quicksight-dataset-lookbackwindow-sizeunit"></a>
The size unit that is used for the lookback window column. Valid values for this structure are `HOUR`, `DAY`, and `WEEK`.  
*Required*: Yes  
*Type*: String  
*Allowed values*: `HOUR | DAY | WEEK`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)