# CastColumnTypeOperation
<a name="API_CastColumnTypeOperation"></a>

A transform operation that casts a column to a different type.

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

 ** ColumnName **   <a name="QS-Type-CastColumnTypeOperation-ColumnName"></a>
Column name.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Required: Yes

 ** NewColumnType **   <a name="QS-Type-CastColumnTypeOperation-NewColumnType"></a>
New column data type.  
Type: String  
Valid Values: `STRING | INTEGER | DECIMAL | DATETIME`   
Required: Yes

 ** Format **   <a name="QS-Type-CastColumnTypeOperation-Format"></a>
When casting a column from string to datetime type, you can supply a string in a format supported by Quick Sight to denote the source data format.  
Type: String  
Length Constraints: Maximum length of 32.  
Required: No

 ** SubType **   <a name="QS-Type-CastColumnTypeOperation-SubType"></a>
The sub data type of the new column. Sub types are only available for decimal columns that are part of a SPICE dataset.  
Type: String  
Valid Values: `FLOAT | FIXED`   
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/CastColumnTypeOperation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/CastColumnTypeOperation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/CastColumnTypeOperation)