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Hi R user, I could not combine two tables. Would any one help me on how I can combine with following example tables? > T1 X Y Z XX A 1 5 9 13 B 2 6 10 14 C 3 7 11 15 D 4 8 12 16 > T2 X Y XX a 1 4 7 b 2 5 8 c 3 6 9 I want to get the following table cT X Y XX A 1 5 13 B 2 6 14 C 3 7 15 D 4 8 16 A1 1 4 7 B1 2 5 8 C1 3 6 9 Thanks for your help. Thanks, Kristi ===