The CData Power BI Connector for Airtable 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 TableA.SampleCol1, TableB.SampleCol2, TableB.SampleCol3, TableB.SampleCol4 FROM TableA INNER JOIN TableB ON TableA.Id = TableB.Id

Left Join

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

 SELECT TableA.SampleCol1, TableB.SampleCol2, TableB.SampleCol3, TableB.SampleCol4 FROM TableA LEFT JOIN TableB ON TableA.Id = TableB.Id