---
title: MLDataTable.JoinType.left
framework: createml
role: symbol
role_heading: Case
path: createml/mldatatable/jointype/left
---

# MLDataTable.JoinType.left

An operation that is the union between an inner join and the remaining rows from the original data table.

## Declaration

```swift
case left
```

## Discussion

Discussion The .left join type merges missing values.

## See Also

### Selecting a joining operation

- [MLDataTable.JoinType.inner](createml/mldatatable/jointype/inner.md)
- [MLDataTable.JoinType.right](createml/mldatatable/jointype/right.md)
- [MLDataTable.JoinType.outer](createml/mldatatable/jointype/outer.md)