Linking a file to itself

I have a student file containing one record for each student attending each term. (That is, Bob has a attended Fall and Spring semesters during academic year 2006-07. He will have two records in the student file, one with a semester field of "2007-1" and the second record with a semester field of "2007-2".)
I want to determine how many students who attended Fall did (and did not) attend in the Spring.
I select "Student" for the first file I want to query for the report. Then I select "Student" again for the second file for the query; for this latter, the file is given an alias "student1."
I join the two files using a left outer join on the field "student ID", with the student file pointing to the "student1" file.
The results however, appear as if I have an equal join. How come?

You need to link Student --< Registration ---< Registration
Not Student --< Student

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