不同的两列和第三列相加

Question

我有下一张表，名为：mytable：

---------------------------------
|id |  date  | name|actionCount |
---------------------------------
|a1 |03.03.12| ba  |     12     |
|a3 |06.02.13| ba  |     7      |
|a1 |06.02.13| ca  |     2      |
|a3 |06.02.13| ba  |     9      |
|a1 |06.06.13| ba  |     2      |
|--------------------------------

我希望获得不同的ID和名称，并将它们计算在内。

所以我必须得到：

------------------------
|id | name|actionCount |
------------------------
|a1 | ba  |     14     |
|a3 | ba  |     16     |
|a1 | ca  |     2      |
------------------------

我试过了：

SELECT DISTINCT id,name,SUM(actionCount) FROM mytable GROUP BY actionCount

但我得到了：

Column 'mytable.id' is invalid in the select list because it is not contained in either
an aggregate function or the GROUP BY clause.

任何帮助表示赞赏！

Answer 1

你可以尝试这样......

SELECT id,name,SUM(actionCount) FROM mytable GROUP BY id,name