The CData ADO.NET Provider for SAP ERP 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 MARA.MTART, MARC.WERKS FROM MARA, MARC WHERE MARA.MATNR = MARC.MATNR

Left Join

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

SELECT MARA.MTART, MARC.WERKS FROM MARA LEFT JOIN MARC ON MARA.MATNR = MARC.MATNR