SQL查询的最新日期

Question

先谢谢你的帮助。我有下表：

 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    |

---

我的查询似乎无法获得以下结果：最新日期的金额和所有名称的最高金额之和。

  

上面的示例答案是351（101 + 200 + 50）。

Answer 1

我将此解决方案基于

的答案

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