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Really? If you can write code to do it, and that rule could be done, you can build it into the database with referential constraints and triggers.
The CRUD would need to react to error conditions and act accordingly.
Now that said, most databases have not been designed with that in mind relying instead on programs (pick your language at will) to do all of that instead. Doesn't mean it can't be done by a developer ( as opposed to a programmer that just turns specs into code) who takes the time to think it through.
That's called software engineering.
Jim Oberholtzer
Agile Technology Architects
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