Hi. I am doing a sociology project that compares the distance from school to
their grade. I have two sets of data- OSIS (student ID) and Grade and OSIS
and Zip code. It would be simple, however, the set with the zip code has
more data than the one with the grades (since freshmen dont have grades). Is
there a way to take only the data that is in both sets of data and put it in
another colum like this:

OSIS Zip Grade
200111417 11221 65.77
200544351 11220 65.17
200555449 11235 92.93
200570539 11204 83.33

Thanks.