Hi,   Just i would like to know, In SET statement we are able to use multiple dataset name which is in sequence like below to create a dataset, Data C4; Set C1-C3; run;   But why cant we use the same in Data step as below to output many Datasets in sequence?   Data C1-C3; set C4; if a=1 then output C1; if a=2 then output C2; if a=3 then output C3; run;   ... View more