The CData Cmdlets PowerShell Module for Asana 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 P.Id,P.Name,P.color,PS.Id,PS.Title FROM Projects P INNER JOIN ProjectStatuses PS ON P.Id=PS.ProjectId

Left Join

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

SELECT P.Id,P.Name,P.color,PS.Id,PS.Title FROM Projects P LEFT JOIN ProjectStatuses PS ON P.Id=PS.ProjectId