Or should I say, there is no greater burden to what NULL means for a specific column than any other value. You didn't answer my questions, I'm disappointed but

Or should I say, there is no greater burden to what NULL means for a specific column than any other value. You didn't answer my questions, I'm disappointed but not surprised. Since you can't simply provide a valid value for when one doesn't make sense -- you need NULL for those cases, it's unavoidable.