---
title: "-(_:_:)"
framework: tabulardata
role: symbol
role_heading: Operator
path: "tabulardata/-(_:_:)-95yoe"
---

# -(_:_:)

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

## Declaration

```swift
func - <L, R>(lhs: L, rhs: R) -> Column<R.Element> where L : OptionalColumnProtocol, R : ColumnProtocol, L.WrappedElement : AdditiveArithmetic, L.WrappedElement == R.Element
```

## Parameters

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

## Return Value

Return Value A new column with the same type as the right column.

## See Also

### Generating a Column by Subtracting Two Columns

- [-(_:_:)](tabulardata/columnprotocol/-(_:_:)-36zol.md)
- [-(_:_:)](tabulardata/-(_:_:)-25cs6.md)