Answer
26 Mar 2013
license: CPOL
You can do this, but:1) You can add reference to a property set that is unique. 2) As primary key, (A,B,C) is unique.3) If you want to add reference to (A,B), it has to be unique4) If (A,B) is unique thus a primary key candidate, why is (A,B,C) the primary key after all?I smell a...