---
title: "-(_:_:)"
framework: tabulardata
role: symbol
role_heading: Operator
path: "tabulardata/optionalcolumnprotocol/-(_:_:)-5xfkx"
---

# -(_:_:)

Generates a column by subtracting each element in an optional column type from the corresponding elements of another.

## Declaration

```swift
static func - (lhs: Self, rhs: Self) -> Column<Self.WrappedElement>
```

## Parameters

- `lhs`: An optional column type.
- `rhs`: Another optional column type.

## Return Value

Return Value A new column.

## See Also

### Generating an Optional Column by Subtracting Two Columns

- [-(_:_:)](tabulardata/-(_:_:)-25cs6.md)
- [-(_:_:)](tabulardata/-(_:_:)-95yoe.md)