SQL Oracle /聚合查詢

Question

我試圖在Oracle上運行查詢。我有一個帳戶結算付款表，我有一個查詢，可以查看最後三筆結算金額，以及任何已註銷的金額，用於我需要此信息的任何帳戶。

但是，一些帳戶是以每週爲基礎的，對於這些帳戶，我想將他們的每週結算彙總到他們的月度小組中。這裏是我的代碼至今：

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.* 

這工作完全但每週根據賬戶，因此而不是通過過去三年每週量來進行結算拉動，即25-09-17，18-09 -17，2017年9月9日，我想通過9月，8月和7月的總計付款。

我希望這一切都有道理。

Answer 1

只需將聚集來自當前單元的水平（即，每週）給月水平EXTRACT(month ...)在內部查詢的SELECT和GROUP BY以及PARTITION和PIVOT條款修改：

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（隨機數據）：

http://rextester.com/UJK84858