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Yes, in Mixpanel's Custom Property Formula, you can use a function similar to SQL's IS NULL. The equivalent function in Mixpanel is called defined().Here's how you can use it: 1. To check if a property is not null (equivalent to IS NOT NULL in SQL):
```LBKSLBKS2. To check if a property is null (equivalent to IS NULL in SQL):
```LBKS not(defined(properties["Your_Property_Name"]))
```LBKSLBKSThe `defined()` function determines if a value exists. If a property is not defined on a parent event or profile, this will return false, otherwise it will return true.LBKSIt's worth noting that in Mixpanel, null values are parsed as `(not set)` in the UI, but will appear as `<null> ` or `null` when looking at raw data.LBKS[Custom Properties: Calculate new properties on the fly ](https://docs.mixpanel.com/docs/features/custom-properties#reference) Reference> provides more details on the functions available in Custom Property Formulas, including the `defined()` function.
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