N个月消费居前的用户的报表

客户需求如下：N个月消费居前的用户的报表（每个月消费高于等于或者低于等于某一个值，连续多少个月）

SELECT *
  FROM (SELECT COUNT(*) OVER(PARTITION BY cldjh, rn) cnt, t.*
          FROM (SELECT add_months(rq,
                                  -row_number()
                                  OVER(PARTITION BY cldjh ORDER BY rq)) rn,
                       t.*
                  FROM tj_dl t
                 WHERE fl = 3
                   AND rq >= to_date('2014-01-01', 'yyyy-mm-dd')
                   AND rq <= to_date('2014-05-01', 'yyyy-mm-dd')
                   AND zxygz >= 100) t) tt
WHERE tt.cnt =
       months_between(to_date('2014-05-01', 'yyyy-mm-dd'),
                      to_date('2014-01-01', 'yyyy-mm-dd')) + 1

统计连续5个月内，电量连续大于100的记录