Environment Details
Snowflake External Tables are not showing in the Alteryx Visual Query Builder tab.
The highlighted tables are Snowflake External tables that are visible in the Tables tab.

The External Tables do not show up when browsing for objects in the Visual Query Builder tab.
- Alteryx Designer
- Snowflake ODBC Drivers
- Snowflake
Cause
The query that runs in the background for the Visual Query Builder only focus to show table objects, whereas the Tables tab runs a more comprehensive query to show objects.
Resolution
Vote "thumbs up" to the following Alteryx Designer Idea to have External Tables to be visible in the Visual Query Builder. Higher voted ideas are more likely to be considered for enhancement.
Workaround
Use the aid of the Tables tab to pull an initial query to pull data and/or use the Editor tab to place custom queries. For more information, please see the "How to Build Queries without using the Visual Query Builder" article.
Note
Writing to an External table using the Output Data tool is not supported. If trying to do so will create a normal table within Snowflake. Submit a new Alteryx Idea to have this feature in a future release of Alteryx Designer.