The CData Power BI Connector for Splunk supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT DataModels.Name, Datasets.ObjectName FROM DataModels INNER JOIN Datasets ON DataModels.Id = Datasets.ModelName

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

SELECT DataModels.Name, Datasets.ObjectName FROM DataModels LEFT JOIN Datasets ON DataModels.Id = Datasets.ModelName