The CData Power BI Connector 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