Can we achieve feature like outer-join in HCM extracts ?

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Can we achieve feature like outer-join in HCM extracts ?

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Hi,

Can we achieve feature like outer-join in HCM extracts ?

Just to give a background: We have a Employees UE, Assignments UE, Payroll UE and Element Entries UE. 
Employee UE Root --> Thread Database item: PErson_id --> Next Connect --> Assignment UE, ---> Next connect --> Payroll UE --> Next Connect --> Element Entries UE. Right now, after joining, we get only those employees who has payroll attached. 
We need a outer-join kind of feature where also those employees come up who do not have payroll attached . Kindly advise.