The CData Excel Add-In for Veeva Vault 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.Id, c.Name, o.Id, o.Name FROM Documents c INNER JOIN Products o ON c.Id = o.DocumentId

Left Join

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

 SELECT c.Id, c.Name, o.Id, o.Name FROM Documents c LEFT JOIN Products o ON c.Id = o.DocumentId