Question

我试图基于两列求和，其中两行中的值相等。这是我的桌子：

Country   | System     | Money
 AAA      | A          | 10
 AAA      | A          | 200
 AAA      | B          | 60
 BBB      | B          | 600
 BBB      | A          | 150
 BBB      | B          | 140

这是我要实现的目标：

Country   | System     | Money  | SystemSum
 AAA      | A          | 10     |  210
 AAA      | A          | 200    |  210
 AAA      | B          | 60     |  60
 BBB      | B          | 600    |  740
 BBB      | A          | 150    |  150
 BBB      | B          | 140    |  740

这是我尝试过的：

SUM(Money) OVER (ORDER BY Country, System ROWS UNBOUNDED PRECEDING)

，但它会累积返回值。如何正确执行？

Answer 1

您可以进行窗口求和，但是您需要删除rows子句：由于您指定了rows unbounded preceding，因此查询只考虑了前面的行，而您希望对整个分区求和：

select 
    t.*, 
    sum(money) over(partition by country, system) systemsum
from mytable as t

旁注：不按顺序指定preceding行实际上是没有意义的-使用这种语法，您会在分区内得到一组 undefined 行。

Answer 2

您可以分组

select a.Country, a.System, a.Money, SystemSum
from tbl a inner join
(
    select Country, System,
    SUM(Money) as SystemSum
    from tbl
    group by Country, System
) b on a.Country = b.Country and a.System = b.System

与ROWS UNBOUNDED PRECEDING一起使用的窗口函数将累计所有Money的先前值，因此您之前获得的结果

Answer 3

您似乎想要Country和System的组合之和。可以使用窗口函数，但是使用partition by而不是order by：

SELECT t.*,
       SUM(Money) OVER (PARTITION BY Country, System)
FROM t;

Answer 4

您似乎只是按(country, system)分组。试试看：

SELECT 
  Country, System, Money, 
  SUM(Money) OVER(PARTITION BY Country, System) AS SystemSum
FROM MyTable

这将为您提供基于组的SUM，而且还返回所有详细的行数据。

Answer 5

您可以根据需要使用over partition by子句。

WITH TBL(COUNTRY,SYSTEM,MONEY) AS (
 SELECT 'AAA' AS COUNTRY,'A' AS SYSTEM ,10  AS MONEY FROM DUAL UNION ALL
SELECT 'AAA' AS COUNTRY,'A' AS SYSTEM ,200 AS MONEY FROM DUAL UNION ALL
SELECT 'AAA' AS COUNTRY,'B' AS SYSTEM ,60  AS MONEY FROM DUAL UNION ALL
SELECT 'BBB' AS COUNTRY,'B' AS SYSTEM ,600 AS MONEY FROM DUAL UNION ALL
SELECT 'BBB' AS COUNTRY,'A' AS SYSTEM ,150 AS MONEY FROM DUAL UNION ALL
SELECT 'BBB' AS COUNTRY,'B' AS SYSTEM ,140 AS MONEY FROM DUAL )
SELECT COUNTRY,SYSTEM,MONEY,SUM(MONEY)OVER(PARTITION BY COUNTRY,SYSTEM) AS SUMALL FROM TBL

如何根据Teradata中的条件对多行数据求和？

5 个答案: