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# AWS::CleanRoomsML::TrainingDataset ColumnSchema
<a name="aws-properties-cleanroomsml-trainingdataset-columnschema"></a>

Metadata for a column.

## Syntax
<a name="aws-properties-cleanroomsml-trainingdataset-columnschema-syntax"></a>

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

### JSON
<a name="aws-properties-cleanroomsml-trainingdataset-columnschema-syntax.json"></a>

```
{
  "[ColumnName](#cfn-cleanroomsml-trainingdataset-columnschema-columnname)" : String,
  "[ColumnTypes](#cfn-cleanroomsml-trainingdataset-columnschema-columntypes)" : [ String, ... ]
}
```

### YAML
<a name="aws-properties-cleanroomsml-trainingdataset-columnschema-syntax.yaml"></a>

```
  [ColumnName](#cfn-cleanroomsml-trainingdataset-columnschema-columnname): String
  [ColumnTypes](#cfn-cleanroomsml-trainingdataset-columnschema-columntypes): 
    - String
```

## Properties
<a name="aws-properties-cleanroomsml-trainingdataset-columnschema-properties"></a>

`ColumnName`  <a name="cfn-cleanroomsml-trainingdataset-columnschema-columnname"></a>
The name of a column.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[a-zA-Z0-9_](([a-zA-Z0-9_ ]+-)*([a-zA-Z0-9_ ]+))?$`  
*Minimum*: `1`  
*Maximum*: `128`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`ColumnTypes`  <a name="cfn-cleanroomsml-trainingdataset-columnschema-columntypes"></a>
The data type of column.  
*Required*: Yes  
*Type*: Array of String  
*Minimum*: `1`  
*Maximum*: `1`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)