Common SQL does not provide a general interface to vendor-specific syntax.
There are two approaches you can take with SQL such as this:
SELECT B.PARTY_CODE_ALIAS, A.VALUE FROM CODES A, CODE_ALIASES B
WHERE A.DOMAIN=B.CODE_DOMAIN(+) AND A.VALUE=B.CODE_VALUE(+)
AND B.PARTY_ID(+)=<party_id>
(sql:select [b party_code_alias] [a value]
:from '([codes a] [codes_aliases b])
:where [and [= [a domain]
(sql:sql-expression
:string "B.CODE_DOMAIN(+)")]
[= (sql:sql-expression
:string "B.PARTY_ID(+)") PARTY-ID]])