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 UWA week 20 (1st semester, week 11) ↓
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7:20pm Thu 16th May, Lyu L.

Hi, professor I have a question about the standard of combination. You mention that : "HINT: for each of the 3 input files, create a temporary version with an extra column that combines country code and year. You can then use join to join two of the 3 files, and then the third with the new combination." I notice that there are different ways, such as inner, Left, right and outer join, which will influence the output. I have no idea which one should I choose, as the sample2.tsv just has few data. In the output file, should it include all the "code + year" from three files, even if some files don't have this match key's data? or just base on one file to match, making sure this code year has data? thank you.

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