Oracle Decode行变列

select resid, delay, discard

  from (select a.resid,

               sum(decode(a.ditemid, 'aaa', a.value, '')) ||

               sum(decode(a.ditemid, 'B_WebDNSDW', a.value, '')) delay,

               sum(decode(a.ditemid, 'B_WebTCPDelayW', a.value, null)) ||

               sum(decode(a.ditemid, 'bbb', a.value, '')) discard

          from (select resid, ditemid, value

                  from rmcinfo t

                 where ditemid IN ('B_WebDNSDW', 'B_WebTCPDW')

                   and resid = 'APP02op7') a

         group by a.resid)