Can a linking table have two mutually exclusive columns?

Here's a thought to fix the problem without breaking much code. Create a newtable students and populate with the data from both the other tables and a flag field to indicate full or part time. Then create views that have the names of the full time students and part time students table.

This means all selects will still work perfectly and all you will have to do is fix the insert and update code to go to the new table.

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