# Replace Null Values

By default, when updating existing Salesforce records, where the data is populated in Salesforce e.g. email, and the source data has a blank value, Salesforce will simply ignore the update. By selecting this option, the Blank values will be accepted by Salesforce, and the field data will be deleted.

<figure><img src="/files/b5p4weJqSsBhOidVq24J" alt=""><figcaption></figcaption></figure>

This is only available for Upsert and Update operations.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.dataimporter.io/formatting/replace-null-values.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.