---
schema_version: "1"
id: eb61492b5a4a84936c824173ae67078a9a287f71d6c42fd7c39b6c5b04b8725e
title: Update a Schema
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/data/264-0-0/c360_a_update_action.md
canonical_url: https://help.salesforce.com/s/articleView?id=data.c360_a_update_action.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 3e67fda56aef38be4a47303ba04d4bf1ae122b6226b7a4517abae16192537655
description: After your schema is created in Data 360, update formula fields or source fields as needed.
products:
  - Data 360
release: "264"
---
# Update a Schema

After your schema is created in Data 360, update formula fields or source fields as needed.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: <strong>All Editions</strong> supported by Data 360. See <a href="https://help.salesforce.com/s/articleView?id=data.c360_a_dc_editions.htm&amp;language=en_US" target="_blank">Data 360 edition availability</a>.</td></tr></tbody></table>

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small permission">
        <colgroup>
          <col style="width:50%">
          <col style="width:50%">
        </colgroup>
        <thead class="slds-text-title_caps ">
          <tr class="">
            <th scope="colgroup" class="slds-cell-wrap" colspan="2" style="text-align:left;vertical-align:top;" id="d40542e60">User Permissions
              Needed</th>
          </tr>
        </thead>
        <tbody>
          <tr class="">
            <td data-label="User Permissions Needed" class="slds-cell-wrap" style="vertical-align:top;" headers="d40542e60 ">To update a schema</td>

            <td class="slds-cell-wrap" style="vertical-align:top;" headers="d40542e60 ">
              <p>Data Cloud Architect permission set OR</p>
              <p style="margin-bottom:0;">Manage External Connections or
                Customize Application permissions</p>
            </td>

          </tr>
        </tbody>
      </table>

1. To modify a formula, navigate to the field list on the data streams details page.
2. Find the specific formula field you wish to modify and select **Edit Formula** from the dropdown.
3. To overwrite the formula, update the formula syntax and click **Save**
    
    ![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-data-data_cloud-264-0-0-production-enus/f3569962-3c9b-4f83-9d0c-b6a574e785da/images/icon_note.png)
    
    Note Changes to formula logic are applied on a go-forward basis, not retroactively. To keep logic consistent across all data imports, import historical data into Data 360 after the change has been applied.
    
    ![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-data-data_cloud-264-0-0-production-enus/f3569962-3c9b-4f83-9d0c-b6a574e785da/images/icon_note.png)
    
    Note Formula fields that are designated as the Primary Key or Event Date Time field can’t be modified.
    
    ![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-data-data_cloud-264-0-0-production-enus/f3569962-3c9b-4f83-9d0c-b6a574e785da/images/icon_note.png)
    
    Note Any changes you make to fields or objects that have already been activated aren’t applied to existing fields. Instead, these changes create new fields in the data extension. New fields are updated on the data extension upon the next refresh after field creation.