The CData Excel Add-In 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