# sort(on:_:order:) Arranges the rows of a data frame according to two columns that you select by their column identifiers. ``` mutating func sort(on columnID0: ColumnID, _ columnID1: ColumnID, order: Order = .ascending) where T0 : Comparable, T1 : Comparable ``` ## Parameters `columnID0` The identifier of a column. `columnID1` The identifier of another column. `order` A sorting order. ## Discussion> Note: Elements with a value of `nil` are less than all non-`nil` values. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)