Alternative choice for ROW_NUMBER?

Question

Hello,
I have two tables:
NAME_tab
PERSID ___ First ___ Last
1 _________ Hans ___ Schmidt
2 _________ Klaus ___ Meier
ADDRESS_tab
ADDRID _ PERSID _ Street ____ Nr.
1 _______ 2 _______ UUU _____ x ( <---------------- Klaus Meier)
2 _______ 1 _______ VVV _____ y ( <---------------- Hans Schmidt)
3 _______ 1 _______ WWW ___ z ( <---------------- Hans Schmidt)
In a report region I want to display each person with only the first person-specific adress-entry:
First _____ Last ______ Street _ Nr.
Hans ____ Schmidt ___ VVV __ y
Klaus ____ Meier _____ UUU __ x
The columns in this region are enabled to be sorted.
I tried it with ROW_NUMBER function, but this forces an ORDER BY. And I cant use an ORDER BY if I enable the sort-option for the columns.
I hope you have a good advice for me!
Best regards!
Jens

Answer 1

Thank you, Heinz,
but I have only one report region and if I am using min() I get only one record,i.g.:
First _____ Last ______ Street _ Nr.
Hans ____ Schmidt ___ VVV __ y
I want this result:
First _____ Last ______ Street _ Nr.
Hans ____ Schmidt ___ VVV __ y
Klaus ____ Meier _____ UUU __ x
Here is the SQL-code with ROW_NUMBER. It works so far, but I can't set columns to be sorted by the user, because of "ORDER BY" within ROW_NUMBER.
select * from (
select
p.PERS_ID, p.NAME, p.VORNAME,
a.STRASSE, a.HAUSNR, a.ADR_ID,
ROW_NUMBER() over (partition by p.PERS_ID order by a.ADR_ID) R
from PERSON p, ADRESSE a
where p.PERS_ID = a.PERS_ID (+)
where R = 1
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