How can I use lead/lag in this query

I have written this query which gives me the comparative data based on this week and next week. How can I use Lead/Lag in this query.
   WITH CURRENT_WEEK
          AS ( SELECT   QPAQ.YEAR YEAR,
                         QPAQ.SEASON SEASON,
                         REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+') ACC_SERIES,
                         TO_NUMBER (QPAQ.WEEK) WEEK,
                         MAX (QPAQ.FAILURES) FAILURES
                  FROM   QAR_PLAN_ACC_QTY QPAQ, QAR_PLAN_THRESHOLD_LST QPTL
                 WHERE       QPTL.CATEGORY_ID = 7
                         AND QPAQ.YEAR = QPTL.YEAR
                         AND QPAQ.SEASON = QPTL.SEASON
                         AND QPAQ.SERIES_NAME = QPTL.MODEL_SERIES
              GROUP BY   QPAQ.YEAR,
                         QPAQ.SEASON,
                         REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+'),
                         TO_NUMBER (QPAQ.WEEK)
              ORDER BY   REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+')),
       LAST_WEEK
          AS ( SELECT   QPAQ.YEAR YEAR,
                         QPAQ.SEASON SEASON,
                         REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+') ACC_SERIES,
                         TO_NUMBER (QPAQ.WEEK + 1) WEEK,
                         MAX (QPAQ.FAILURES) FAILURES
                  FROM   QAR_PLAN_ACC_QTY QPAQ, QAR_PLAN_THRESHOLD_LST QPTL
                 WHERE       QPTL.CATEGORY_ID = 7
                         AND QPAQ.YEAR = QPTL.YEAR
                         AND QPAQ.SEASON = QPTL.SEASON
                         AND QPAQ.SERIES_NAME = QPTL.MODEL_SERIES
              GROUP BY   QPAQ.YEAR,
                         QPAQ.SEASON,
                         REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+'),
                         TO_NUMBER (QPAQ.WEEK)
              ORDER BY   REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+'))
     SELECT   CURRENT_WEEK.YEAR,
              CURRENT_WEEK.SEASON,
              CURRENT_WEEK.ACC_SERIES,
              CURRENT_WEEK.WEEK,
              CURRENT_WEEK.FAILURES,
              (CURRENT_WEEK.FAILURES - LAST_WEEK.FAILURES) FAILURES_COMPARE
       FROM   LAST_WEEK, CURRENT_WEEK
      WHERE   CURRENT_WEEK.WEEK = LAST_WEEK.WEEK(+)
   ORDER BY   CURRENT_WEEK.WEEK;Output is like this.
                YEAR         SEASON     MODEL                     WEEK        FAILURES    Failures_COMPARE
1     2011     SUMMER     VGP-BMS15     49     10
2     2011     SUMMER     VGP-BMS15     50     28       18
3     2011     SUMMER     VGP-BMS15     51     30       2
4     2011     SUMMER     VGP-BMS15     52     40       10Edited by: BluShadow on 06-Jan-2012 13:26
added {noformat}{noformat} tags. Please read {message:id=9360002} to learn to do this yourself in future.

You would jettison the entire LAST_WEEK subquery. Then replace your failure calculation with
current_week.failure - lag(current_week.failure) over (order by current_week.year, current_week.week) as failures_compareI suppose you might want to think about renaming the sub-query as well ....
Cheers, APC
Edited by: APC on Jan 6, 2012 1:41 PM

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