> For the complete documentation index, see [llms.txt](https://help.delpha.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.delpha.io/delpha-for-salesforce/how-to-faq/delpha-duplicate/filtering-rule-one-value-is-set.md).

# Filtering rule - One value is set

## Case 1 – Two records differ, one has a non-null value 

* Condition: `Field__c` is not the same
* Expected match: `Field__c` is equal to `"MyNonNullValue"`

## **Case 2 – Two records differ, one is null**

* Issue: The operator *is not the same* does not treat null values as valid inputs. When a null is encountered in a comparison, the rule simply returns false and does not apply.
* Workaround: Create a formula field that returns the text `"empty"` when the original field is blank, and otherwise returns the field’s value.
* Updated rule:
  * Condition: `Field__c` is not the same
  * Expected match: `Field__c` is equal to `"empty"`   

## Case 3 – Two records differ on a Boolean field (one is `true`)

* Condition: `Field__c` is not the same
* Expected match: `Field__c` is equal to `true`


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