Answers:
Yes. Please read about the merge function. This function merges two data frames by common columns or row names.
For combining 2 data frames, please explore merge(), rbind() and cbind() functions in R by typing ?merge, ?rbind and ?cbind in the R console. A combination of 2 or more datasets depends upon their dimensions and data type, it is possible but be more specific about the type of the datasets to be combined so that we may help you better.
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