The CData ADO.NET Provider 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