Hint: Paste examples of text files like CSV into a code box opened on the forum with the {I} icon so you get something like:
name,sex,age,height,weight
Alfred ,M ,14,69,112.5
Alice ,F ,13,56.5,84
Barbara ,F ,13,65.3,98
Carol ,F ,14,62.8,102.5
Henry ,M ,14,63.5,102.5
James ,M ,12,57.3,83
Then we can see your data without downloading it. Also because of a variety of issues between the forum and such the CSV may only be "viewed" as a spreadsheet. Which in some cases has a potential for making the data look different than it actually is and can them be difficult to trace down what you see when attempting something versus what we have available.
Since CSV are not data sets they do not actually have "variable names" yet, only column headers. When you read the CSV into a SAS data set then you get variables. So read the CSV so that the correct variable names are used in the first place. At the same time you should also make sure that properties like variable type, numeric or character, and lengths are the same if the intent is to combine this data.
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