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# MLDataTable.PackType

The storage operations for combining multiple columns into one.

```
enum PackType
```

## Topics

### Selecting a packing operation

[`case sequence`](/documentation/CreateML/MLDataTable/PackType/sequence)

A packing type that combines the values of several columns into a sequence type.

[`case dictionary`](/documentation/CreateML/MLDataTable/PackType/dictionary)

A packing type that combines the values of several columns into a dictionary type.

## Relationships

### Conforms To

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Equatable`](/documentation/Swift/Equatable)

---

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