# IcebergSortField
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Defines a single sort field in an Iceberg sort order specification.

## Contents
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 ** direction **   <a name="AmazonS3-Type-s3Buckets_IcebergSortField-direction"></a>
The sort direction. Valid values are `asc` for ascending order or `desc` for descending order.  
Type: String  
Valid Values: `asc | desc`   
Required: Yes

 ** null-order **   <a name="AmazonS3-Type-s3Buckets_IcebergSortField-null-order"></a>
Specifies how null values are ordered. Valid values are `nulls-first` to place nulls before non-null values, or `nulls-last` to place nulls after non-null values.  
Type: String  
Valid Values: `nulls-first | nulls-last`   
Required: Yes

 ** source-id **   <a name="AmazonS3-Type-s3Buckets_IcebergSortField-source-id"></a>
The ID of the source schema field to sort by. This must reference a valid field ID from the table schema.  
Type: Integer  
Required: Yes

 ** transform **   <a name="AmazonS3-Type-s3Buckets_IcebergSortField-transform"></a>
The transform to apply to the source field before sorting. Use `identity` to sort by the field value directly, or specify other transforms as needed.  
Type: String  
Required: Yes

## 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/s3tables-2018-05-10/IcebergSortField) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3tables-2018-05-10/IcebergSortField) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/s3tables-2018-05-10/IcebergSortField)