> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://help.sigmacomputing.com/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://help.sigmacomputing.com/_mcp/server. # Example representation: Workbook with a union (Beta) > Example Sigma code representation of a workbook with a union. This documentation describes one or more public beta features that are in development. Beta features are subject to quick, iterative changes; therefore the current user experience in the Sigma service can differ from the information provided in this page. This page should not be considered official published documentation until Sigma removes this notice and the beta flag on the corresponding feature(s) in the Sigma service. For the full beta feature disclaimer, see [Beta features](/docs/sigma-product-releases#beta-features). This is an example representation of a workbook, retrieved using the [Get a workbook](/reference/get-workbook) endpoint with the query parameter `includeContents=true`. Representations like this one can be used to create a workbook from code using the [Create a workbook](/reference/create-workbook) endpoint. Each page in this example library includes the code representation of the workbook and step-by-step instructions to create it in the Sigma UI. Consult this example and others in the [Workbook representation example library](/docs/workbook-representation-example-library) to: * Troubleshoot the formatting of a particular feature in code representation * Relate a feature from the Sigma UI to its representation in code * Provide context to AI tools used to create workbooks from code This example representation cannot be used as-is. All identifying details, such as IDs, names, and URLs, have been replaced with randomized ID values or generic substitutions. The format of these contents, like the length of ID values, is preserved for demonstrative purposes. However, this representation cannot be directly used without modification to the base URL, connection details, and more. For more information, see [Create and manage workbooks from code](/docs/manage-workbooks-as-code). ## System and user requirements To complete the steps in this example, you must meet the user requirements listed below for creating the workbook in the UI and creating it from code. The ability to create this workbook in the Sigma UI requires the following: * You must be assigned an [account type](/docs/account-type-and-license-overview) with the **Create, edit, and publish workbooks** permission enabled. * You must have access to a connection to a data platform. The ability to create a workbook from code requires the following: * You must be assigned an [account type](/docs/account-type-and-license-overview) with the **Create, edit, and publish workbooks** permission enabled. * You must have developer credentials for the Sigma API. For more information, see [Get started with the Sigma REST API](/reference/get-started-sigma-api). This example uses a table from the [Sigma Sample Connection](/docs/sigmas-sample-connection). Your organization might have disabled access to the Sigma sample connection. If so, you can contact an admin to enable it, or use a table from another connection to follow along with this example. ## Create the example workbook in the Sigma UI This example shows a workbook with a table sourced from a union that stacks loan applications together with funded loans. To create this workbook in the Sigma UI: 1. Go to the **Home** page. 2. Select ![](https://sigma-docs-screenshots.s3.us-west-2.amazonaws.com/Icons/button-add.svg) **Create new** > **Workbook**. A new workbook opens. 3. From the **Add element** bar, select **Data** > **Table** > **Union**. 4. In the **Select source** modal, search for the table `OAKMARK_BANK_LOAN_APPLICATIONS` in the `EXAMPLES.DATACAMP` schema, then choose **Select**. 5. In **Sources**, select ![](https://sigma-docs-screenshots.s3.us-west-2.amazonaws.com/Icons/add.svg) **Add source**. 6. In the **Select source** modal, select the `OAKMARK_BANK_LOANS` table in the same schema, then choose **Select**. 7. In **Sources**, under the table names, match the following columns across the two tables: | Output column | Loan applications | Loans | | :-------------------------- | :---------------------------- | :--------------- | | Application Id | *Application Id* | *Application Id* | | Customer Id | *Customer Id* | *Customer Id* | | Application Date | *Application Date* | *Start date* | | Loan Type | *Loan Type* | *Loan Type* | | Amount | *Loan Amount* | *Principal* | | Term Years | *Requested Term Years* | *Term Years* | | Credit Score at Application | *Credit Score at Application* | *No match* | | Status | *Status* | *Status* | 8. Select **Done**. 9. In the document header, select **Save as**. 10. Enter a name for the workbook, such as `union`. 11. Select **Save**. ## Get a code representation of this workbook To get a representation of this workbook, follow the steps in [Get the code representation of a workbook](/docs/get-the-code-representation-of-a-workbook). The code representation of this workbook appears like the following: #### YAML representation ```yaml workbookId: c8fc162f-d561-4ed8-b9f6-c04632c78031 workbookUrlId: qmTEGGrmmKnL0MIT2nBtkR createdBy: zgzXpTRVbfX4ZE9TEm9q9fUsfXZ5o updatedBy: zgzXpTRVbfX4ZE9TEm9q9fUsfXZ5o createdAt: '2026-09-01T14:57:59.189Z' updatedAt: '2026-09-08T17:17:31.310Z' name: union url: https://aws-api.sigmacomputing.com/org-name/workbook/qmTEGGrmmKnL0MIT2nBtkR path: My Documents/ latestVersion: 5 ownerId: zgzXpTRVbfX4ZE9TEm9q9fUsfXZ5o isArchived: false contents: schemaVersion: 1 elements: - id: BWpDAJYAj1 kind: table source: kind: union sources: - connectionId: b2af3691-12a0-48fa-a91d-fbe2e1b31627 kind: warehouse-table path: - EXAMPLES - DATACAMP - OAKMARK_BANK_LOAN_APPLICATIONS - connectionId: b2af3691-12a0-48fa-a91d-fbe2e1b31627 kind: warehouse-table path: - EXAMPLES - DATACAMP - OAKMARK_BANK_LOANS matches: - outputColumnName: Application Id sourceColumns: - '[Application Id]' - '[Application Id]' - outputColumnName: Customer Id sourceColumns: - '[Customer Id]' - '[Customer Id]' - outputColumnName: Application Date sourceColumns: - '[Application Date]' - '[Start Date]' - outputColumnName: Loan Type sourceColumns: - '[Loan Type]' - '[Loan Type]' - outputColumnName: Loan Amount sourceColumns: - '[Loan Amount]' - '[Principal]' - outputColumnName: Requested Term Years sourceColumns: - '[Requested Term Years]' - '[Term Years]' - outputColumnName: Credit Score at Application sourceColumns: - '[Credit Score at Application]' - null - outputColumnName: Status sourceColumns: - '[Status]' - '[Status]' columns: - id: ntQlDMco00 formula: '[Union of 2 Sources/Application Id]' - id: 5sVSOPN0oT formula: '[Union of 2 Sources/Customer Id]' - id: 7ycTlyQ71e formula: '[Union of 2 Sources/Application Date]' - id: oBmHE1c7RB formula: '[Union of 2 Sources/Loan Type]' - id: yE4yFL8FKQ formula: '[Union of 2 Sources/Loan Amount]' - id: W2wQgMSYo5 formula: '[Union of 2 Sources/Requested Term Years]' - id: wnrt6ew0Ma formula: '[Union of 2 Sources/Credit Score at Application]' - id: WolrHTU6Zu formula: '[Union of 2 Sources/Status]' order: - ntQlDMco00 - 5sVSOPN0oT - 7ycTlyQ71e - oBmHE1c7RB - yE4yFL8FKQ - W2wQgMSYo5 - wnrt6ew0Ma - WolrHTU6Zu visibleAsSource: false pages: - id: eKhTktnw name: Page 1 kind: workbook layout: | documentVersion: 5 ``` ## Representing unions #### Union representation ```yaml ... id: BWpDAJYAj1 kind: table source: kind: union sources: - connectionId: b2af3691-12a0-48fa-a91d-fbe2e1b31627 kind: warehouse-table path: - EXAMPLES - DATACAMP - OAKMARK_BANK_LOAN_APPLICATIONS - connectionId: b2af3691-12a0-48fa-a91d-fbe2e1b31627 kind: warehouse-table path: - EXAMPLES - DATACAMP - OAKMARK_BANK_LOANS matches: - outputColumnName: Application Id sourceColumns: - '[Application Id]' - '[Application Id]' - outputColumnName: Customer Id sourceColumns: - '[Customer Id]' - '[Customer Id]' - outputColumnName: Application Date sourceColumns: - '[Application Date]' - '[Start Date]' - outputColumnName: Loan Type sourceColumns: - '[Loan Type]' - '[Loan Type]' - outputColumnName: Loan Amount sourceColumns: - '[Loan Amount]' - '[Principal]' - outputColumnName: Requested Term Years sourceColumns: - '[Requested Term Years]' - '[Term Years]' - outputColumnName: Credit Score at Application sourceColumns: - '[Credit Score at Application]' - null - outputColumnName: Status sourceColumns: - '[Status]' - '[Status]' columns: - id: ntQlDMco00 formula: '[Union of 2 Sources/Application Id]' - id: 5sVSOPN0oT formula: '[Union of 2 Sources/Customer Id]' - id: 7ycTlyQ71e formula: '[Union of 2 Sources/Application Date]' - id: oBmHE1c7RB formula: '[Union of 2 Sources/Loan Type]' - id: yE4yFL8FKQ formula: '[Union of 2 Sources/Loan Amount]' - id: W2wQgMSYo5 formula: '[Union of 2 Sources/Requested Term Years]' - id: wnrt6ew0Ma formula: '[Union of 2 Sources/Credit Score at Application]' - id: WolrHTU6Zu formula: '[Union of 2 Sources/Status]' order: - ntQlDMco00 - 5sVSOPN0oT - 7ycTlyQ71e - oBmHE1c7RB - yE4yFL8FKQ - W2wQgMSYo5 - wnrt6ew0Ma - WolrHTU6Zu visibleAsSource: false ... ```