The CData Power BI Connector for SAP Concur 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 ListItems.Name, Lists.Name FROM ListItems, Lists WHERE ListItems.ListID=Lists.ID

Left Join

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

SELECT ListItems.Name, Lists.Name FROM Lists LEFT OUTER JOIN ListItems ON ListItems.ListID=Lists.ID