So... I'm stuck at this problem. So I have dataset a, looks something like this id1 1 2 3 and another dataset b, id2 1 2 I want to merge a and b to a new dataset ab, to make it looks like this : id1 id2 1 1 1 2 2 1 2 2 3 1 3 2 how to do this??? Thanks!!!
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