Help on select clause

Question

REMOTE_CUSTOMER_ID     SAP_DEAL_PARENT_CODE     LOCAL_CUSTOMER_ID
84786                    SECONDARY          73699
84786                    primary               73699
84786                    NULL                      73713
my sub query returns the above result set ,
i want to select LOCAL_CUSTOMER_ID if the SAP_DEAL_PARENT_CODE  primary ,
if primary is  null then i want LOCAL_CUSTOMER_ID of secondary  ,if both are not avaiable then LOCAL_CUSTOMER_ID of null,
i treid to used nvl2,case and coalesce,could you guys please provides some idea to solve this problem
Thanks
VijayEdited by: vijayp on Oct 18, 2010 1:40 PM

Answer 1

Hi,
You may remove the GROUP BY if you always expect only one REMOTE_CUSTOMER_ID value :
SELECT remote_customer_id,
       min(local_customer_id)
         keep ( dense_rank first
                order by case upper(sap_deal_parent_code)
                          when 'PRIMARY' then 1
                          when 'SECONDARY' then 2
                          else 3
                         end
              ) as local_customer_id
FROM customer
GROUP BY remote_customer_id
;