how to implement outer Join?

Ques--how to implement outer Join?
Ans--select Poassign_account.Project_Code,
       Poassign_account.Vendor_Name,
       Poassign_account.Job_Type,
       Invoice_No.Project_Code,
       Invoice_No.Invoice_No,
       Invoice_No.Po_No
       from
       Poassign_account right outer join Invoice_No on Poassign_account.Project_Code=Invoice_No.Project_Code