Logical Data Modeling - (Derived|Calculated) Attribute (Derived Data)

About

Derived is a property of:

The value can be calculated or deduced from relationship Groupings or from the values of other variable. The value of a Derived variable changes constantly.

There is then a functional dependency between two variables.

UI

This kind of dependency is really common in UI development when one action must refresh a part of the UI. It's often implemented with an observer pattern.

Examples

  • Student Age,
  • Account Balance,
  • Number of courses taken.

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