# Class: ForeignKey 


_Foreign-key constraint linking field(s) in this resource to field(s) in another resource._





URI: [fts:ForeignKey](https://specs.frictionlessdata.io/table-schema/ForeignKey)





```mermaid
 classDiagram
    class ForeignKey
    click ForeignKey href "../ForeignKey/"
      ForeignKey : fields
        
      ForeignKey : reference
        
          
    
        
        
        ForeignKey --> "1" ForeignKeyReference : reference
        click ForeignKeyReference href "../ForeignKeyReference/"
    

        
      
```




<!-- no inheritance hierarchy -->

## Slots

| Name | Cardinality and Range | Description | Inheritance |
| ---  | --- | --- | --- |
| [fields](fields.md) | 1..* <br/> [String](String.md) | Field name(s) in this resource that participate in the key | direct |
| [reference](reference.md) | 1 <br/> [ForeignKeyReference](ForeignKeyReference.md) | The target of the reference | direct |





## Usages

| used by | used in | type | used |
| ---  | --- | --- | --- |
| [TableSchema](TableSchema.md) | [foreignKeys](foreignKeys.md) | range | [ForeignKey](ForeignKey.md) |












## Identifier and Mapping Information





### Schema Source


* from schema: https://specs.frictionlessdata.io/table-schema




## Mappings

| Mapping Type | Mapped Value |
| ---  | ---  |
| self | fts:ForeignKey |
| native | fts:ForeignKey |






## LinkML Source

<!-- TODO: investigate https://stackoverflow.com/questions/37606292/how-to-create-tabbed-code-blocks-in-mkdocs-or-sphinx -->

### Direct

<details>
```yaml
name: ForeignKey
description: Foreign-key constraint linking field(s) in this resource to field(s)
  in another resource.
from_schema: https://specs.frictionlessdata.io/table-schema
attributes:
  fields:
    name: fields
    description: Field name(s) in this resource that participate in the key.
    from_schema: https://specs.frictionlessdata.io/table-schema
    domain_of:
    - TableSchema
    - ForeignKey
    - ForeignKeyReference
    range: string
    required: true
    multivalued: true
  reference:
    name: reference
    description: The target of the reference.
    from_schema: https://specs.frictionlessdata.io/table-schema
    rank: 1000
    domain_of:
    - ForeignKey
    range: ForeignKeyReference
    required: true
    inlined: true

```
</details>

### Induced

<details>
```yaml
name: ForeignKey
description: Foreign-key constraint linking field(s) in this resource to field(s)
  in another resource.
from_schema: https://specs.frictionlessdata.io/table-schema
attributes:
  fields:
    name: fields
    description: Field name(s) in this resource that participate in the key.
    from_schema: https://specs.frictionlessdata.io/table-schema
    alias: fields
    owner: ForeignKey
    domain_of:
    - TableSchema
    - ForeignKey
    - ForeignKeyReference
    range: string
    required: true
    multivalued: true
  reference:
    name: reference
    description: The target of the reference.
    from_schema: https://specs.frictionlessdata.io/table-schema
    rank: 1000
    alias: reference
    owner: ForeignKey
    domain_of:
    - ForeignKey
    range: ForeignKeyReference
    required: true
    inlined: true

```
</details>