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# AWS::EntityResolution::SchemaMapping
<a name="aws-resource-entityresolution-schemamapping"></a>

Creates a schema mapping, which defines the schema of the input customer records table. The `SchemaMapping` also provides AWS Entity Resolution with some metadata about the table, such as the attribute types of the columns and which columns to match on.

## Syntax
<a name="aws-resource-entityresolution-schemamapping-syntax"></a>

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

### JSON
<a name="aws-resource-entityresolution-schemamapping-syntax.json"></a>

```
{
  "Type" : "AWS::EntityResolution::SchemaMapping",
  "Properties" : {
      "[Description](#cfn-entityresolution-schemamapping-description)" : String,
      "[MappedInputFields](#cfn-entityresolution-schemamapping-mappedinputfields)" : [ SchemaInputAttribute, ... ],
      "[SchemaName](#cfn-entityresolution-schemamapping-schemaname)" : String,
      "[Tags](#cfn-entityresolution-schemamapping-tags)" : [ Tag, ... ]
    }
}
```

### YAML
<a name="aws-resource-entityresolution-schemamapping-syntax.yaml"></a>

```
Type: AWS::EntityResolution::SchemaMapping
Properties:
  [Description](#cfn-entityresolution-schemamapping-description): String
  [MappedInputFields](#cfn-entityresolution-schemamapping-mappedinputfields): 
    - SchemaInputAttribute
  [SchemaName](#cfn-entityresolution-schemamapping-schemaname): String
  [Tags](#cfn-entityresolution-schemamapping-tags): 
    - Tag
```

## Properties
<a name="aws-resource-entityresolution-schemamapping-properties"></a>

`Description`  <a name="cfn-entityresolution-schemamapping-description"></a>
A description of the schema.  
*Required*: No  
*Type*: String  
*Minimum*: `0`  
*Maximum*: `255`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`MappedInputFields`  <a name="cfn-entityresolution-schemamapping-mappedinputfields"></a>
A list of `MappedInputFields`. Each `MappedInputField` corresponds to a column the source data table, and contains column name plus additional information that AWS Entity Resolution uses for matching.  
*Required*: Yes  
*Type*: Array of [SchemaInputAttribute](aws-properties-entityresolution-schemamapping-schemainputattribute.md)  
*Minimum*: `2`  
*Maximum*: `35`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SchemaName`  <a name="cfn-entityresolution-schemamapping-schemaname"></a>
The name of the schema. There can't be multiple `SchemaMappings` with the same name.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[a-zA-Z_0-9-]*$`  
*Minimum*: `0`  
*Maximum*: `255`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`Tags`  <a name="cfn-entityresolution-schemamapping-tags"></a>
The tags used to organize, track, or control access for this resource.  
*Required*: No  
*Type*: Array of [Tag](aws-properties-entityresolution-schemamapping-tag.md)  
*Minimum*: `0`  
*Maximum*: `200`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)