Does a merge statement need a by statement? If not, then when do we use a by statement with the merge statement?
Read the documentation first: https://documentation.sas.com/?docsetId=lestmtsref&docsetTarget=n1i8w2bwu1fn5kn1gpxj18xttbb0.htm&doc...
And if it is still not clear, then ask further questions.
In addition, the documentation has a section that outlines the different way to combine data sets all side by side with code examples.
It's definitely worth a read.
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