The CData Power BI Connector for LinkedIn 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 CompanyList.Name, Comments.ContractNumber FROM CompanyList, Comments WHERE CompanyList.Id=Comments.CompanyId

Left Join

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

SELECT CompanyList.Name, Comments.Text FROM CompanyList LEFT OUTER JOIN Comments ON CompanyList.Id=Comments.CompanyId