基于键

Question

在R中，我有两个具有相同字段名Key和Value的数据表。

Table A
+----------+-------+
| Key      | Value |
+----------+-------+
| 20170910 | 10.11 |
+----------+-------+
| 20170911 | 12.21 |
+----------+-------+
| 20170915 | 15.51 |
+----------+-------+
| 20170916 | 33.01 |
+----------+-------+
| 20170912 | 82.2  |
+----------+-------+
| 20170913 | 11.22 |
+----------+-------+
| 20170914 | 2.33  |
+----------+-------+

Table B
+----------+-------+
| Key      | Value |
+----------+-------+
| 20170912 | 3.5   |
+----------+-------+
| 20170913 | 13.2  |
+----------+-------+
| 20170914 | 31.1  |
+----------+-------+
| 20170916 | 33.01 |
+----------+-------+
| 20170910 | 33.11 |
+----------+-------+
| 20170911 | 9.21  |
+----------+-------+
| 20170915 | 52.1  |
+----------+-------+

我需要做的是将Value的{​​{1}}元素与Table A的{​​{1}}元素相乘Value。有没有更好的方法在数据表中执行此操作而不是迭代检查

如果迭代完成，它就像这样

Table B