[R] merge 2 data.frames in dependence of 2 values

[Matthias Weber]

Hello togehter,

i have a little problem. Maybe anyone can help me.

I have 2 data.frames, which look like as follows:
First:

        NAME    MONTH     BONUS
1      Andy     2014-10       100
2      Pete     2014-10        200
3      Marc    2014-10        300
4      Andy    2014-11        400

Second:

      NAME  MONTH    BONUS_2
1    Andy    2014-10       150
2    Pete     2014-11       180
3    Jason   2014-10       190
4    Paul     2014-10       210
5    Andy    2014-11       30

How can I merge this 2 data.frames, if I want the following result:

        NAME    MONTH     BONUS    BONUS_2
1     Andy     2014-10       100            150
2     Pete     2014-11                         180
3     Marc    2014-10        300
4     Andy    2014-11       400             30
5     Pete     2014-10       200
6     Jason  2014-10                         190
7     Paul     2014-10                         210

The important thing is, that for every accordance in the Columns "NAME" and "MONTH" I get a new line.

Thanks for your help.

Best regards.

Mat

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