To many rows returned

Question

Hello,
I have a query in which I would like to return one result or another depending on the record returned. Using the 'IN' statement is returning multiple rows. I only want one of the rows with a preference. How can I do that?
If I have company records with more than one address type, I need address_type = 'PCFILING', if no 'PCFILING', return 'LEGAL' address. Can I do this in one select query?
Select query currently reads:
select a.company_name, a.naic, b.owner_eid, E.RELATION_SUB_TYPE_CODE ,
d.address_1, d.address_2, d.city, d.state_code, D.ZIP_CODE
from tmp_pac_mailing a, identifiers b, licenses c, addresses d, relations e
where
b.identifier_1 = a.naic
and b.category_code = 'NAICNUM'
and b.stop_date is null
and b.OWNER_EID = c.OWNER_EID
and c.license_type_code = 'B'
and c.active_inactive_code = 'A'
and b.owner_eid = e.owner_eid
and e.RELATION_TYPE_CODE = 'ADDRESS'
and e.stop_date is null
AND E.RELATION_SUB_TYPE_CODE in ('PCFILING','LEGAL')
AND E.RELATED_OWNER_EID = D.EID
Some compaines have both PCFILING and LEGAL, but I only want to return one row, PCFILING first, then LEGAL. Have tried DECODE and CASE functions to no avail.
Any ideas would be helpful.
Thanks, Toni

Answer 1

Instead of using the relations table directly, you could use an in-line view along the lines of:
(SELECT related_owner_eid, relation_sub_type_code
FROM  (SELECT related_owner_eid, relation_sub_type_code,
              ROW_NUMBER() OVER(PARTITION BY related_owner_eid
                                ORDER BY DECODE(RELATION_SUB_TYPE_CODE, 'PCFILING',1, 2) rn
       FROM relations
       WHERE relation_type_code = 'ADDRESS' and
             stop_date is null AND
             relation_sub_type_code in ('PCFILING','LEGAL'))
WHERE rn = 1) einstead. You could then remove all references to e.XXX from the WHERE clause except the join condition.
HTH
John