The CData ADO.NET Provider for Tally 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 c.Name, e.MailingName, e.Address, e.EMailID FROM Company c INNER JOIN Employees e ON c.Guid = e.Guid

Left Join

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

 SELECT c.Name, e.MailingName, e.Address, e.EMailID FROM Company c LEFT JOIN Employees e ON c.Guid = e.Guid