---
title: ColumnType
framework: tabulardata
role: symbol
role_heading: Associated Type
path: tabulardata/dataframeprotocol/columntype
---

# ColumnType

A type that conforms to the type-erased column protocol.

## Declaration

```swift
associatedtype ColumnType : AnyColumnProtocol
```

## See Also

### Inspecting a Data Frame Type

- [isEmpty](tabulardata/dataframeprotocol/isempty.md)
- [shape](tabulardata/dataframeprotocol/shape.md)
- [columns](tabulardata/dataframeprotocol/columns.md)
- [rows](tabulardata/dataframeprotocol/rows.md)
- [DataFrame.Rows](tabulardata/dataframe/rows-swift.struct.md)
- [base](tabulardata/dataframeprotocol/base.md)