SELECT "SPOOLER_ID" AS "JOB_SCHEDULER", "JOB_CHAIN", 
       "ORDER_ID", COUNT(*) AS "ORDER_COUNT", 
       SUM("END_TIME"-"START_TIME") AS "ELAPSED"
  FROM SCHEDULER_ORDER_HISTORY s
 WHERE "START_TIME" >= SYSDATE - 10
   AND NVL(TRUNC("END_TIME"), SYSDATE - 1) <= SYSDATE
 GROUP BY "SPOOLER_ID", "JOB_CHAIN", "ORDER_ID";