Displaying 1 result from an estimated 1 matches for "courses_teach".
2005 Apr 20
2
Has And Belongs To Many Validations
Here is the schema that I am working with:
courses -> courses_teachers <- teachers
I want to ensure that a teacher is not assigned the same course more
than once. In other words, if I''m in the courses_teachers table as
teaching Spanish 101, if someone tries to add that same teacher/course
combination to the table again, it will not be allowed.
I tho...