Merging Datasets

 Hi to all, I'm trying to merge two datasets but don't know how. This is what I want to do, I have two dataset (Ds1, Ds2) and want to merge the data to ds3 with an output like this:
Ds1:                                            Ds2:                                         Ds3:
Test1 --> 2                                  Test1 --> 3       &nbs ...