如何通過多列條件求和（SQL）

Question

解釋我想要做什麼有點困難（對於難以閱讀的標題抱歉），但基本上我想總結重複行如下：

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 

所需的輸出：

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

我怎樣才能做到這一點？

Answer 1

的SQL語句的樣子：

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

Answer 2

細節欠缺，但它聽起來像一個簡單的GROUP BY對我說：

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