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ort, its probably a good idea to start with MATCH syntax. Have a read of Chapter 15 in the text "Creating Reports with WF Language". The Match command accomplishes the lateral merger of two files, giving all 6 outcome possibilities. (A, B, A and B, A or B, A not B, B not A); its a good idea to master the MATCH concept, before you move on the mastering JOINS. MATCH is very powerful, and easy. In your example, it seems you want a list of all the students who haven't gotten their diplomas yet. so you'ld be using a A not B scenario. something like: MATCH FILE STUDENTS WRITE ... BY STUDENT_ID RUN FILE STUDENTS_DIPLOMA WRITE ... BY STUDENT_ID AFTER MATCH HOLD OLD-NOT-NEW END ..of course you'll need a master for that diploma file that has a shorter name. And in your second example, you'll be wanting the union, thats A OR B so your command will be AFTER MATCH HOLD OLD-OR-NEW Got it?
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