# AggregateOperation
<a name="API_AggregateOperation"></a>

A transform operation that groups rows by specified columns and applies aggregation functions to calculate summary values.

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

 ** Aggregations **   <a name="QS-Type-AggregateOperation-Aggregations"></a>
The list of aggregation functions to apply to the grouped data, such as `SUM`, `COUNT`, or `AVERAGE`.  
Type: Array of [Aggregation](API_Aggregation.md) objects  
Array Members: Minimum number of 0 items. Maximum number of 128 items.  
Required: Yes

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

 ** Source **   <a name="QS-Type-AggregateOperation-Source"></a>
The source transform operation that provides input data for the aggregation.  
Type: [TransformOperationSource](API_TransformOperationSource.md) object  
Required: Yes

 ** GroupByColumnNames **   <a name="QS-Type-AggregateOperation-GroupByColumnNames"></a>
The list of column names to group by when performing the aggregation. Rows with the same values in these columns will be grouped together.  
Type: Array of strings  
Array Members: Minimum number of 0 items. Maximum number of 128 items.  
Length Constraints: Minimum length of 1. Maximum length of 128.  
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/AggregateOperation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/AggregateOperation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/AggregateOperation)