Items in the parentheses: These are the attributes of the CD entity
For the scaling of values the distances should be relevant and not absolute.
One of the reasons you use data mining is to figure out targeting.
Relational notation is a process of transforming an Entity Relationship Diagram into a more friendly and usable type of diagram that is easily readable. This can be done by taking the names of each table and its attributes and ordering them in a specific order. You always start with the primary key(s), which are commonly notated with the underscore, then all other attributes are added.
The only rule for attributes is if it happens to be a foreign key it needs to be underscored with a dotted line.
The final step in the database modeling evolution is applications and how they affect a database model design.
It is essential to understand that a well-organized design process is critical to success. In addition, a goal to drive the design process is equally as important as the design itself. There is no sense designing or even building an application and its corresponding database unless it is clear exactly what is you are doing to design.