sql问题。。。。求解答~！！！！急啊~~~~~
SELECT Q.NAME DEVICE_NAME,T.NAME T_NAME,B.AVE,B.SD,SUM(CASE WHEN D.OUT_OF_CONTROL=1 THEN 1 ELSE 0 END)OUT_OF_CONTROL_TIME, COUNT(D.ID)TEST_TIME,D.TEST_ID,B.Batch_No,
         POWER(AVG(CASE WHEN D.ISCALPOINT=0 THEN POWER(D.TEST_VAL-SSS,2)ELSE NULL END),0.5),
         AVG(CASE WHEN D.ISCALPOINT=0 THEN D.TEST_VAL WHEN D.ISCALPOINT IS NULL THEN D.TEST_VAL ELSE NULL END)SSS         FROM QC_QCTEST_DATA D,QC_TEST T,QC_DEVICE Q,QC_QCTEST_BATCH B 
         WHERE D.DEV_ID=1715
         AND TO_CHAR(D.TEST_DATE_TIME,'yyyy-MM')='2013-05'
         AND B.TYPE=2
         AND D.BATCH_ID=B.ID
         AND D.DEV_ID=Q.ID
         AND D.TEST_ID=T.ID 
         GROUP BY D.TEST_ID,Q.NAME,T.NAME,B.AVE,B.SD,B.TYPE,B.Batch_No
 


怎么写可以将下面红色SSS内容加到上面红色的位置进行计算？？？现在sql语句是错的 
------解决方案--------------------
这样试试 

SELECT Q.NAME DEVICE_NAME,T.NAME T_NAME,B.AVE,B.SD,

       SUM(DECODE(D.OUT_OF_CONTROL,1,1,0)) OUT_OF_CONTROL_TIME, 

       COUNT(D.ID)TEST_TIME,

       D.TEST_ID,B.Batch_No,

       POWER(AVG(DECODE(D.ISCALPOINT,0,POWER(D.TEST_VAL-AVG(DECODE(NVL(D.ISCALPOINT,0),0,D.TEST_VAL,NULL))),2))),0.5),

       AVG(DECODE(NVL(D.ISCALPOINT,0),0,D.TEST_VAL,NULL)) SSS         

FROM QC_QCTEST_DATA D,QC_TEST T,QC_DEVICE Q,QC_QCTEST_BATCH B 

WHERE D.DEV_ID=1715

         --AND TO_CHAR(D.TEST_DATE_TIME,'yyyy-MM')='2013-05'

         AND D.TEST_DATE_TIME >= TO_DATE('2013-05','YYYY-MM') 

         and D.TEST_DATE_TIME < ADD_MONTHS(TO_DATE('2013-05','YYYY-MM'),1)

         AND B.TYPE=2

         AND D.BATCH_ID=B.ID

         AND D.DEV_ID=Q.ID

         AND D.TEST_ID=T.ID 

         GROUP BY D.TEST_ID,Q.NAME,T.NAME,B.AVE,B.SD,B.TYPE,B.Batch_No