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Setting a limit to number of entries of a form

Setting a limit to number of entries of a form
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Well I've got two tables / forms:
Course Details Table / Form and Booking Details Table / Form.
They are both related.
I want to make it so that the Booking Form can only allow 30 entries of students per course.
The course details table has a course ID and other stuff for the course.
The booking form has a booking ID, course ID and student ID (I also have a students table).
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