---
title: "grouped(by:)"
framework: tabulardata
role: symbol
role_heading: Instance Method
path: "tabulardata/dataframe/grouped(by:)"
---

# grouped(by:)

Creates a grouping of rows that the method selects by choosing unique values in a column.

## Declaration

```swift
func grouped(by columnName: String) -> any RowGroupingProtocol
```

## Parameters

- `columnName`: The name of a column.

## See Also

### Grouping Rows

- [RowGrouping](tabulardata/rowgrouping.md)
- [RowGroupingProtocol](tabulardata/rowgroupingprotocol.md)