st: combine two datasets

[游万海 <wanhaiyou@hnu.edu.cn>]

Dear all,

I have two dataset A and B,
A:
id  year  var1 var2
1  2001  1        2
1  2002  3       4
1  2003  5       6
2  2001  1        2
2  2002  3       4
2  2003  5       6
3  2001  1        2
3  2002  3       4
3  2003  5       6


B:
id year var1 var2
1 2004    1     2
2 2004    3    4
3 2004    5    6

And I want to obtain the dataset C
id year  var1 var2
1  2001  1        2
1  2002  3       4
1  2003  5       6
1  2004  1        2
2  2001  1        2
2  2002  3       4
2  2003  5       6
2  2004  3       4
3  2001  1        2
3  2002  3       4
3  2003  5       6
3  2004  5      6

Thanks very much

Bests,
wanhaiyou
Hunan University

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