> ## Documentation Index
> Fetch the complete documentation index at: https://help.dingtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Aggregate Tables

> Aggregate tables can be used in multiple scenarios, including data linkage, associated forms, reports, data cards, integration & automation/business rules, and querying results through Open API. You can also view data change logs of aggregate tables to trace the source of data calculations and changes.

Aggregate tables cannot directly operate on form data. Once an aggregate table is created, you can use its calculation results in forms, reports, Integration & Automation, data linkage, associated forms, and other scenarios. You can also view data change logs on the aggregate table details page.

## Channels for Using Aggregate Tables

You can use aggregate tables in the following scenarios.

| **Channel**                                 | **Description**                                                                                                                                                                                                                        | **Illustration** |
| ------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- |
| **Data linkage**                            | Aggregate tables support data linkage in forms.<br />• In condition rules, select the title field of an aggregate table on the right.<br />• In linkage rules, select the calculation metric field of an aggregate table on the right. |                  |
| **Associated form**                         | Aggregate tables support data association in associated forms.                                                                                                                                                                         |                  |
| **Report**                                  | Select an aggregate table directly as the data source in a report.                                                                                                                                                                     |                  |
| **Data card**                               | Select an aggregate table directly as the data source in a data card.                                                                                                                                                                  |                  |
| **Integration & Automation/Business rules** | Query data from aggregate tables in Integration & Automation and business rules.<br />Note: Directly modifying or deleting aggregate table data is not supported.                                                                      |                  |
| **Open API**                                | Query the results of aggregate tables through Open API.                                                                                                                                                                                |                  |

## View Data Operation Logs

To help Admins trace the calculation and change source of aggregate table result data, the platform provides a data change log feature. On the aggregate table details page, click the **View** button in the action column of a record to view its **change log**.