SQL & PL/SQL

Using: Oracle 10gR2 RAC on SUSE Linux 9 (10.2.0.3)

In the process of converting a Microsoft Access database to Oracle, an Access query is using the FIRST function.
What is the Oracle equivalent of the Microsoft Access FIRST function?

In the attempt to convert, the Oracle FIRST_VALUE function was used. However, the same results was not achieved.
Thanks,
(BLL)

Query:
h2. ACCESS:
SELECT
TRE.GCUSNO,
UCASE([DCUSNO]) AS DCUSNO_STD,
*FIRST(UCASE([DNAME])) AS DNAME_STD*,
*FIRST(UCASE([DADDR])) AS DADDR_STD*,
*FIRST(UCASE([DCITY])) AS DCITY_STD*,
TRE.DSTATE,
FIRST(TRE.DZIP) AS DZIP,
TRE.DREGN,
TRE.DDIST,
TRE.DSLSMN,
TRE.DCHAIN,
TRE.MARKET,
TRE.MKTPGM,
TRE.EUMKT
FROM
TRE
GROUP BY
TRE.GCUSNO,
UCASE([DCUSNO]),
TRE.DSTATE,
TRE.DREGN,
TRE.DDIST,
TRE.DSLSMN,
TRE.DCHAIN,
TRE.MARKET,
TRE.MKTPGM,
TRE.EUMKT;



h2. ORACLE:
SELECT DISTINCT
TRE.GCUSNO,
UPPER(TRIM(TRE.DCUSNO)) AS DCUSNO_STD,
UPPER(TRIM(TRE.DNAME)) AS DNAME_STD,
UPPER(TRIM(TRE.DADDR)) AS DADDR_STD,
FIRST_VALUE(UPPER(TRIM(TRE.DNAME)) IGNORE NULLS) OVER (ORDER BY TRE.GCUSNO) AS DNAME_STD,
FIRST_VALUE(UPPER(TRIM(TRE.DADDR)) IGNORE NULLS) OVER (ORDER BY TRE.GCUSNO) AS DADDR_STD,
FIRST_VALUE(UPPER(TRIM(TRE.DCITY)) IGNORE NULLS) OVER (ORDER BY TRE.GCUSNO) AS DCITY_STD,
TRE.DSTATE,
TRE.DZIP,
FIRST_VALUE(UPPER(TRIM(TRE.DZIP)) IGNORE NULLS) OVER (ORDER BY TRE.DZIP ASC) AS DZIP,
TRE.DREGN,
TRE.DDIST,
TRE.DSLSMN,
TRE.DCHAIN,
TRE.MARKET,
TRE.MKTPGM,
TRE.EUMKT
FROM CRM.TREUP100R TRE
GROUP BY
TRE.GCUSNO,
UPPER(TRIM(TRE.DCUSNO)),
TRE.DNAME,
TRE.DADDR,
TRE.DCITY,
TRE.DSTATE,
TRE.DZIP,
TRE.DREGN,
TRE.DDIST,
TRE.DSLSMN,
TRE.DCHAIN,
TRE.MARKET,
TRE.MKTPGM,
TRE.EUMKT;