# Summarize

Use the Summarize node to aggregate items together, in a manner similar to Excel pivot tables.

## Node parameters

* **Fields to Summarize**:
  * To combine values, select an **Aggregation** method, and enter a **Field** name.
  * To split values, enter a field name or list of names in **Fields to Split By**.
* **Options** > **Add Field**: use this to add more optional settings, including:
  * **Disable Dot Notation**: when disabled, you can't reference child fields (in the format `parent.child`).
  * **Output Format**:
    * **Each Split in a Separate Item**: splitting generates a separate output item for each split out field.
    * **All Splits in a Single Item**: splitting generates a single item, which lists the split out fields.
  * **Ignore items without valid fields to group by**: ignore input items that don't contain the field specified in **Fields to Summarize**.


## Related resources

Learn more about [data structure and data flow](#) in Mosaic Workflows workflows.