我有一个如下所示的数据表:
Name | Date-Freq | Date-Amount | Date-Freq | Date-Amount
A | 4 | 3000 | 8 | 9000
B | 5 | 4000 | 9 | 7000
C | 6 | 5000 | 10 | 8000
我希望它看起来像这样:
Name | Date | Freq | Amount
A | July 2014 | 4 | 3000
A | Aug 2014 | 8 | 9000
B | July 2014 | 5 | 4000
B | Aug 2014 | 9 | 7000
C | July 2014 | 6 | 5000
C | Aug 2014 | 10 | 3000
做这样的事情的最好方法是什么?我应该只创建两个新列吗?