Display SQL results in rows instead of a single line - sql

Question

I have the following tables:
Table Offices:
OfficeID MainAddId SubAddId1 SubAddId2 PortAddId1
------- -------- -------- -------- --------
2 1 2 3 5
Table Address:
AddressID Street City ZipCode State
------- -------- -------- -------- --------
1 Forest Ave New York 10001 New York
2 Morris St Philadelphia 19019 Pennsylvania
3 David St Raleigh 27513 North Carolina
Table Port:
PortID PortName Street City ZipCode State
------- ------- -------- -------- -------- --------
5 New York Harbour Bay St New York 10001 New York
I want to write an SQL request such that if any of the addresses Id in the office table is not null,
it will return the list of addresses in a list like:
AddressID Street City ZipCode State
------- -------- -------- -------- --------
1 Forest Ave New York 10001 New York
2 Morris St Philadelphia 19019 Pennsylvania
3 David St Raleigh 27513 North Carolina
5 Bay St New York 10001 New York
Any help on how I can do this please? Thanks
Here is what I tried (partly cause it's not working):
select *
from Office offi
left join Address add1 on offi.MainAddId = add1.AddressID
left join Address add2 on offi.SubAddId1= add2.AddressID
where offi.OfficeID = 2;
However, this is returning the addresses on a single line.

Answer 1

Don't use multiple joins if you really need them. Instead of that, you can use OR after ON in join.
I solved using UNION:
select a.AddressID, a.street, a.city, a.zipcode, a.state
from offices o
inner join address a on (o.MainAddid = a.addressId or o.subaddid1 = a.addressid or o.subaddid2 = a.addressid)
union
select p.PortId, p.street, p.city, p.zipcode, p.state
from offices o
inner join port p on p.portId = o.PortAddId1
Check demo on DB<>FIDDLE

Answer 2

Try this one query :
SELECT *
FROM ( SELECT AddressID, Street, City, ZipCode, State
FROM address
UNION
SELECT PortID, Street, City, ZipCode, State
FROM Port) w
WHERE addressid IN ( SELECT Addresses
FROM ( SELECT OfficeID, MainAddId, SubAddId1, SubAddId2, PortAddId1
FROM Offices) p
UNPIVOT ( Addresses
FOR Offices IN (MainAddId, SubAddId1, SubAddId2, PortAddId1)) AS unpvt );