SQL Query的最新日期

Question

預先感謝您的幫助。我有以下表格：

Name | LastUpdate | Amount | 
ABC | 2014-4-9 | 100 | 
ABC | 2014-4-9 | **101** | 
ABC | 2014-4-8 |  99 | 
DEF | 2014-4-9 | **200** | 
DEF | 2014-4-8 | 160 | 
GHI | 2014-4-9 | **50** | 
GHI | 2014-4-8 |  80 | 

---

我的查詢似乎並不合作，得到以下結果：金額的最新日期之和最高金額爲所有名稱。

以上示例答案爲351（101 + 200 + 50）。

Answer 1

我基於該回答此溶液至

find maximum of set of columns for multiple rows in mysql query

SELECT SUM(Amount) AS Total 
FROM table1 AS t 
WHERE LastUpdate = (SELECT MAX(LastUpdate) 
        FROM table1 
        WHERE NAme = t.Name) 
AND Amount = (SELECT MAX(Amount) 
       FROM table1 
       WHERE Name = t.Name 
       AND LastUpdate = t.LastUpdate) 

DEMO