User347430248 posted
Hi Mike89.
You had asked,"how can I include the 'po box' if it's the only address available for the person."
You can try to fire 2 queries. one for getting main address and second for fetching data that only have po box as address.
Then you can combine the result using Union.
Reference:
Set Operators - UNION (Transact-SQL)
Regards
Deepak