如何通过多列条件求和（SQL）

Question

解释我正在尝试做什么有点困难（对于难以阅读的标题感到抱歉），但基本上我想要重复这样的行：

表A：

EntryID| Country | Region | Sales 
101    | USA     | North  | $10
102    | USA     | North  | $5
103    | USA     | South  | $15
104    | USA     | South  | $10
105    | CHINA   | North  | $5
106    | CHINA   | North  | $5
107    | CHINA   | South  | $10
108    | CHINA   | South  | $20

期望输出：

EntryID| Country | Region | Sales 
101    | USA     | North  | $15
103    | USA     | South  | $25
105    | CHINA   | North  | $10
107    | CHINA   | South  | $30

我该怎么做？

Answer 1

SQL语句必须如下所示：

SELECT MIN(EntryID) AS EntryID,
  Country,
  Region,
  SUM(Sales) AS Sales
FROM TABLE
GROUP BY Country,
  Region

Answer 2

缺乏详细信息，但对我来说这听起来很简单GROUP BY：

select min(EntryID), Country, Region, sum(sales)
  from tbl
 group by Country, Region