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Data Loader best practices and scope

Nulling field values with in Data Loader

The article instructs on how to set field values to null using Data Loader by following a series of steps, including creating a job, selecting the update operation, and modifying a CSV template.

Nulling a field means setting its value to blank or removing the existing value. With Data Loader, you can null field using the Update action. Follow these steps to null field values:

  1. Click + New to create a new job drop-down.
  2. Select the Update operation.
  3. Choose the appropriate template for the object you want to update.
  4. Click Download CSV Template .
  5. In the downloaded CSV file:
    • Enter True in the IsMarker column (if applicable for the object).
    • Provide a valid Record ID for each row — this is mandatory for updates.
    • Select and retain only the columns you want to update.
    • For the fields you want to null, type the word Null in the corresponding cells.

You can delete unused columns from the template to simplify the file.

  • You can combine field updates and nulling in a single job — Data Loader supports updating and nulling different fields in the same record.
  • Make sure the field you are nulling is not a required field in the schema.
  • If you are nulling a custom field, make sure its default value is blank. Else, Data Loader will reset the field to its default value instead of keeping it blank.

Sample Files:

Sample File 1

Sample File 2

Last updated: January 9, 2026