获取 Oracle 中子组的 12 个月运行总计

Question

我正在尝试获取连续 12 个月的数据总计，但当我的字段中的值发生变化时也会发生变化。 我为表中的一个值制作了一个更简单的 sql 小提琴，用于 3 个月的运行总计。 我陷入了两个部分：1）如何获取运行总计，但每次字段值更改时都将其更改，2）如何将该运行总计写回到我的表中。 （或者，我想我可以有第二个表并写入该表。是的，这可能更容易。）

-- INIT database
CREATE TABLE Product (
  Bill_Date         DATE,
  LGroup            VARCHAR2(250 BYTE),
  District          VARCHAR2(50 BYTE),
  MonthTot          NUMBER(15,4),
  Last12Tot         NUMBER(18,4)
);

INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('05/01/2022','MM/DD/YYYY'), 'Sam','West', 13);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('06/01/2022','MM/DD/YYYY'), 'Sam','West', 10);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('07/01/2022','MM/DD/YYYY'), 'Sam','West', 11);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('08/01/2022','MM/DD/YYYY'), 'Sam','West', 8);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('05/01/2022','MM/DD/YYYY'), 'Chi','West', 21);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('06/01/2022','MM/DD/YYYY'), 'Chi','West', 19);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('07/01/2022','MM/DD/YYYY'), 'Chi','West', 15);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('08/01/2022','MM/DD/YYYY'), 'Chi','West', 11);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('05/01/2022','MM/DD/YYYY'), 'Emi','East', 8);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('06/01/2022','MM/DD/YYYY'), 'Emi','East', 5);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('07/01/2022','MM/DD/YYYY'), 'Emi','East', 6);
INSERT INTO Product(Bill_Date, LGroup, District, MonthTot) VALUES (to_date('08/01/2022','MM/DD/YYYY'), 'Emi','East', 4);

-- QUERY database
SELECT * FROM Product;
-- this will do a running total for one group
SELECT bill_date, LGroup, District, MonthTot
     , sum(MonthTot) over (order by bill_date, LGroup, District rows between 2 preceding and current row) as Last12Tot
from (
  select bill_date, LGroup, District, MonthTot
  from Product
  where LGroup = 'Sam'
      )
order by LGroup, District, bill_date
;

所以我的数据集看起来像这样：

BILL_DATE   LGROUP  DISTRICT    MONTHTOT
01-MAY-22   Sam     West        13   
01-JUN-22   Sam     West        10   
01-JUL-22   Sam     West        11   
01-AUG-22   Sam     West        8    
01-MAY-22   Chi     West        21   
01-JUN-22   Chi     West        19   
01-JUL-22   Chi     West        15   
01-AUG-22   Chi     West        11   
01-MAY-22   Emi     East        8    
01-JUN-22   Emi     East        5    
01-JUL-22   Emi     East        6    
01-AUG-22   Emi     East        4   

我当前的查询返回此：

BILL_DATE   LGROUP  DISTRICT    MONTHTOT    LAST12TOT
01-MAY-22   Sam     West        13          13
01-JUN-22   Sam     West        10          23
01-JUL-22   Sam     West        11          34
01-AUG-22   Sam     West        8           29

我不会在多个区中拥有一个 LGroup，因此 LGroup 本质上是我需要进行分组的依据。没有主键 - 它已经是通过查询组装的数据，以获取每个人和每个地区每月的总数。

每次我尝试获取所有组时，我的分区根本不起作用。 我有多年的经验，想要一个 12 个月的滚动总数，但仅限于每个组内。

一旦有了这个，我就可以将我的小组总数相加以获得地区总数。

Answer 1

使用

PARTITION BY

和

RANGE

窗口：

SELECT bill_date,
       LGroup,
       District,
       MonthTot,
       sum(MonthTot) over (
         PARTITION BY LGroup
         order by bill_date, District
         RANGE BETWEEN INTERVAL '12' MONTH PRECEDING AND CURRENT ROW
       ) AS Last12Tot
FROM   Product
order by LGroup, District, bill_date;