Equivalent for TOP 1 of SQL Server used in subqueries

Hi all,
I am trying to migrate a sql query from SQL Server to Oracle 9i, which uses the SQL Server TOP keyword in correlated subqueries.
How should I write it in Oracle?
The query is more complicated, but in principle looks like:
SELECT TAB1.t1_id, TAB2_t2_id,
ISNULL((select top 1 val_num
from values where values.val_id = TAB1.val_id ) ,0),
TAB1.date,
     (select top 1 TAB3.t3_id from TAB3 where TAB3.name = TAB1.name)
FROM TAB1, TAB2
WHERE TAB1.org_id = TAB2.org_id
     AND TAB1.date > TO_DATE('2006-01-01', 'YYYY-MM-DD')
     TAB2.required IS NOT NULL
If I would remove in each subquery the "top 1" and add "and rownum = 1", it will not work.
Any suggestions?
Thanks,
Paul

http://www.ispirer.com/doc/sqlways38/Output/SQLWays-1-044.html

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