> For the complete documentation index, see [llms.txt](https://docs.cascade.io/cascade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cascade.io/cascade/cascade-faqs/functions-and-expressions/how-to-remove-null-records-with-a-filter-tool.md).

# How to Remove null Records with a Filter tool

To remove null records from a dataset with a [Filter](/cascade/tools/transform/filter.md) tool, we recommend using the [ISNULL()](/cascade/functions-and-expressions/functions/logical/isnull.md) function.

<figure><img src="/files/tCiQH4A8DpRnCP0UKuuY" alt=""><figcaption><p><a href="/pages/-MYR3o1w3rCmzihDSyfB">Filter</a> tool configuration with an <a href="/pages/-MYYX6Wm4hzIuIl0L3dq">ISNULL()</a>is null function</p></figcaption></figure>