我的数据如下所示:http://sqlfiddle.com/#!2/1266b2/1
但我希望它看起来像:
+------------+------+---+
| 2015-01-01 | walk | 1 |
| 2015-01-01 | run | 0 |
| 2015-01-01 | bike | 0 |
| 2015-01-02 | walk | 0 |
| 2015-01-02 | run | 0 |
| 2015-01-02 | bike | 0 |
| 2015-01-03 | walk | 0 |
| 2015-01-03 | run | 1 |
| 2015-01-03 | bike | 0 |
| 2015-01-04 | walk | 0 |
| 2015-01-04 | run …