> For the complete documentation index, see [llms.txt](https://resources.less.tech/less-tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://resources.less.tech/less-tech/modelling/action-guides/merge.md).

# Merge

- [Append](https://resources.less.tech/less-tech/modelling/action-guides/merge/append.md): Add columns from one table to another (cross-join, cartesian join, etc.)
- [Combine](https://resources.less.tech/less-tech/modelling/action-guides/merge/combine.md): Combine two different tables into a unified data set
- [Stack](https://resources.less.tech/less-tech/modelling/action-guides/merge/stack.md): Merge data set by stacking them on top of each other