If we want to change the value of one of the attributes of a particular branch in the StaffBranch relation, for example the address for branch number B003, we must update the tuples of all staff located at that branch. If this modification is not carried out on all the appropriate tuples of the StaffBranch relation, the database will become inconsistent. In this example, branch number B003 may appear to have different addresses in different staff tuples.