Known issue - Data warehouse data preview might fail if multiple data warehouse items
The data warehouse data preview in the user experience might fail if there's more than one data warehouse item in the Object Explorer.
Status: Open
Product Experience: Data Warehouse
Symptoms
The data preview fails with error: Unable to execute the SQL request.
Solutions and workarounds
As a workaround, use T-SQL queries instead of the data preview in the data warehouse user experience.