Is there a way to concatenate ore than two strings together using an ORACLE CONCAT statement. I don't want to have to resort to the following:-

Code:
CONCAT(CONCAT('A','B'),'C')
....as I've got four rows from a table that I need to concat together....
Is there another way? I am unable to use a function as the DB techincaly belongs to another company and we're not allowed to add/alter the schema.

Basically, the table I'm interested in contains addresses, the columns are ADDRESS1,ADDRESS2,ADDRESS3,ADDRESS4 and POSTCODE. I want to concat these using commas to separate them.

TIA