> 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/basics/fill.md).

# Fill

If you have any nulls or empty values in your data set that you want to fill, you should use the Fill Action. If you want to remove nulls, check out the [Filter](/less-tech/modelling/action-guides/basics/filter.md) Action.

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