Re: RM VERY STRONG SUGGESTION 4: TRANSITION CONSTRAINTS

Brian wrote:

>As Codd has written, and as Bob Badour continually asserts every time
>the subject of surrogate keys comes up: Every key is a surrogate.

Not in my terminology.

>A surrogate for what? For an object in the microworld being modeled.
[...]
>If that doesn't constitute a mapping, then perhaps you can enlighten
>me as to what does.

You're right that a mapping is intended, but it is outside the database and not usually completely defined. People or applications may turn out to have conflicting mappings for the same database table.

-- 
Reinier