Thank you, i think i got it now. :) Two more clarifications, though: Can there be more than one teacher per session? Can there be more than one student per session? That is, "by definition" as opposed to how it just happens to work out.

In reply to Re^5: Avoiding SQL double jeopardy by Pope-O-Matik
in thread Avoiding SQL double jeopardy by GrandFather

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