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I'm collecting data on students from 3 different points in time.
Given I have a unique id for each student, and for each point in time
I have a different database, how do I go about in tracking the
student? That is, what is the best way to know if student X
participated in time 1 and time 2? Or if student X just participated
in time 1?
I am thinking that an IF THEN statement should work, but am unsure
exactly how to write it.
Thank you,
Sharon.
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