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How to ensure a "unique" related record?

Question asked by Nerico_1 on Jun 27, 2011

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How to ensure a "unique" related record?

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I have a lectures table and a faculty table.  There is a third table used to assign the faculty to the lecture to allow for more than one faculty to be assigned to each lecture.  However, I need to make one of the faculty the "primary" contact for the lecture.  While it would be OK to have many "secondary" faculty assigned to each lecture, I want to prevent anyone from inadvertently making more than one primary assignment.  Any suggestions as to how to enforce this?  

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