我有这张桌子：
+---------+------------+-------+
| Name | Date | Debt |
+---------+------------+-------+
| Michael | 2019-01-01 | 29.9 |
+---------+------------+-------+
| Sarah | 2019-01-01 | 9.99 |
+---------+------------+-------+
| Michael | 2019-01-02 | 10.99 |
+---------+------------+-------+
| Sarah | 2019-01-02 | 12.99 |
+---------+------------+-------+
我想创建这样的东西：
+---------+---------+----------+-------+
| Name | January | February | Total |
+---------+---------+----------+-------+
| Michael | 29.9 | 10.99 | 40.89 |
+---------+---------+----------+-------+
| Sarah | 9.99 | 12.99 | 22.98 |
+---------+---------+----------+-------+
我尝试使用内部联接并使用AS关键字。