SQL Oracle /聚合查询

Question

我试图在Oracle上运行查询。我有一个帐户结算付款表，我有一个查询，可以查看最后三笔结算金额，以及任何已注销的金额，用于我需要此信息的任何帐户。

但是，一些帐户是以每周为基础的，对于这些帐户，我想将他们的每周结算汇总到他们的月度小组中。这里是我的代码至今：

SELECT * 
FROM  (
    SELECT * 
    FROM (
      SELECT gwod.account_id, 
        gwod.charge_period_start, 
        SUM(gwod.total_due_on_charge) total_due_on_charge, 
        SUM(gwod.amount_written_off) amount_written_off, 
        DENSE_RANK() over (PARTITION BY gwod.account_id 
             ORDER BY charge_period_start DESC) rownumber 
      FROM  report.accounts_write_off gwod 
      WHERE account_id IN (‘account_number’) 
      GROUP BY gwod.account_id, 
        gwod.charge_period_start 
      HAVING SUM (gwod.total_due_on_charge) <> 0) t1 
    WHERE t1.rownumber <=3) 
    PIVOT (MAX(charge_period_start) charge_period, 
      MAX(total_due_on_charge) total_due_on_charge, 
      MAX(amount_written_off) amount_written_off 
      FOR rownumber IN (1,2,3)) 
ORDER BY account_id.* 

这工作完全但每周根据账户，因此而不是通过过去三年每周量来进行结算拉动，即25-09-17，18-09 -17，2017年9月9日，我想通过9月，8月和7月的总计付款。

我希望这一切都有道理。

Answer 1

只需将聚集来自当前单元的水平（即，每周）给月水平EXTRACT(month ...)在内部查询的SELECT和GROUP BY以及PARTITION和PIVOT条款修改：

SELECT * 
FROM  (
    SELECT * 
    FROM (
      SELECT gwod.account_id, 
        EXTRACT(month FROM gwod.charge_period_start) charge_period_month, 
        SUM(gwod.total_due_on_charge) total_due_on_charge, 
        SUM(gwod.amount_written_off) amount_written_off, 
        DENSE_RANK() over (PARTITION BY gwod.account_id 
             ORDER BY EXTRACT(month FROM gwod.charge_period_start) DESC) rownumber 
      FROM  report.accounts_write_off gwod 
      WHERE account_id IN ('account_number') 
      GROUP BY gwod.account_id, 
        EXTRACT(month FROM gwod.charge_period_start) 
      HAVING SUM (gwod.total_due_on_charge) <> 0) t1 
    WHERE t1.rownumber <=3) 
    PIVOT (MAX(charge_period_month) charge_period, 
      MAX(total_due_on_charge) total_due_on_charge, 
      MAX(amount_written_off) amount_written_off 
      FOR rownumber IN (1,2,3)) 
ORDER BY account_id.* 

DEMO（随机数据）：

http://rextester.com/UJK84858