Use of complex UNION select query in Value set with validation type = table

Summary

Objective : To group in one value set all the statuses setup in SCM Cloud (DOO_STATUSES, HOLD_CODE and CANCEL_REASON_CODE)

Content

Hello team, 

I need to create a custom value set with validation type = table.
The table would be the UNION of 3 tables like below.
The objective is to get all the statuses of SCM cloud in one attribute managed by this custom value set.

Here is the SQL query which work with BIPublisher, and that I want to use in the value set.

Thank you for your advices

select ALLSTATUSES.Code, ALLSTATUSES.Description
from(
select 
ds.status_code as Code,