我对SQL很新,这已经让我感到困惑了一段时间!
我开始时需要通过playerID聚合一堆列。
+-----------+------------+---------------+--------+
| playerID | AA | BB | CC |
+-----------+------------+---------------+--------+
| Adam | 5 | 2 | 10 |
| Josh | 12 | 3 | 10 |
| Sam | 8 | 5 | 15 |
| Adam | 2 | 5 | 25 |
| Sam | 4 | 4 | 5 |
| Josh | 10 | 3 | 6 |
| Adam| 4 | 2 | 7 |
+-----------+------------+---------------+--------+
理想情况下,最终结果将为每个玩家总结AA,BB和CC并给出类似的东西
| playerID | AA | BB | CC |
+-----------+------------+---------------+--------+
| Adam | 11 | 9 | 42 |
| Josh | 22 | 6 | 16 |
| Sam | 12 | 9 | 20 |
+-----------+------------+---------------+--------+
我设法至少将同名的记录组合在一起
SELECT playerID, COUNT(*) c FROM playertable GROUP BY playerID
但是我不确定如何将记录分组后如何正确地加总。任何帮助将不胜感激!!