I want to concatenate the three data sets by its observation, please give me the idea to proceed on it. data set A; Num Var1 1 abc 4 xyz 5 mno Data set B; Num Var1 2 aaa 5 qqq 7 zzz Data set C; Num Var1 3 qwe 6 ert 4 rty Result dataset should be as below: Num Var1 1 abc 2 aaa 3 qwe 4 xyz 5 qqq 6 ert 5 mno 7 zzz 4 rty The result dataset should be read first combine observation of each dataset, then second observations , so on so forth. Its like dataset A have questions data. B has answers data and C has explanation data. The result should be Question, answer and explanation in the order. thanks and regards Ash
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