Getting only row

Question

Hi
I want only row in the query , but is returning 2 rows
SELECT contr.loc_cntr_id_sn, contr.setid, contr.effdt
  FROM sysadm.ps_loc_cntrct_sn contr, sysadm.ps_rd_company cp
WHERE cp.companyid = contr.companyid
   AND cp.setid = contr.setid
   AND cp.duns_number = '10560771000197'
   AND contr.effdt = (select max(ctr.effdt)
                         from sysadm.ps_loc_cntrct_sn ctr
                        where ctr.effdt <= sysdate and ctr.rowid = contr.rowid)
        LOC_CNTR_ID_SN     SETID     EFFDT
     300010                    GERAL     4/19/2007
     300010                    GERAL     4/20/2007

Answer 1

Hi
I tried as
SELECT *
  FROM (SELECT contr.loc_cntr_id_sn,
               contr.setid,
               contr.effdt,
               max(contr.effdt) over(PARTiTION BY loc_cntr_id_sn order by effdt desc) maiordata
          FROM sysadm.ps_loc_cntrct_sn contr, sysadm.ps_rd_company cp
         WHERE cp.companyid = contr.companyid
           AND cp.setid = contr.setid
           AND cp.duns_number = '10560771000197'
           and contr.effdt <= sysdate)
WHERE MAIORDATA = EFFDTand work fine, is there some way best ?