Sql 在oracle中按天数连续检索记录

我想检索一天中现金存款超过4到1000000的记录，并持续5天以上

我提出了以下问题

    SELECT COUNT(a.txamt) AS "txcount"
           , SUM(a.txamt) AS "txsum"
           , b.custcd
           , a.txdate
      FROM tb_transactions a 
INNER JOIN tb_accounts b 
        ON a.acctno = b.acctno
     WHERE a.cashflowtype = 'CR'
     GROUP BY b.custcd, a.txdate 
    HAVING COUNT(a.txamt)>4 and SUM(a.txamt)>='1000000'
     ORDER BY a.txdate;

但是，如果这种模式持续5天，我就无法找到记录

如何达到预期的效果？

类似于：

SELECT *
FROM   (
  SELECT t.*,
         COUNT( txdate ) OVER ( PARTITION BY custcd
                                ORDER BY txdate
                                RANGE BETWEEN INTERVAL '0' DAY PRECEDING
                                          AND INTERVAL '4' DAY FOLLOWING ) AS 
num_days
  FROM   (
    select count(a.txamt) as "txcount",
           sum(a.txamt) as "txsum",
           b.custcd,
           a.txdate
    from   tb_transactions a inner join tb_accounts b on a.acctno=b.acctno
    where  a.cashflowtype='CR'
    group by b.custcd, a.txdate
    having count(a.txamt)>4 and sum(a.txamt)>=1000000
  ) t
)
WHERE num_days = 5
order by a.txdate;

这是什么意思？“一天内现金存款超过4笔，总计1000000笔，并持续5天以上”。样本数据和预期结果将有所帮助。