# grouped(by:_:) Creates a grouping from two columns of different types. ``` func grouped(by column0: ColumnID, _ column1: ColumnID) -> some RowGroupingProtocol where T0 : Hashable, T1 : Hashable ``` ## Parameters `column0` A column identifier. `column1` A second column identifier. --- 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)