Logical Data Modeling - Value (Operand)

A value may be obtained by:

• observation
• or measurement

Values may represents the structural characteristic of:

• an entity (case)
• or a relationship

A value is stored in a field (cell).

Values are classified into different value sets called attribute (feet, color, first-name, and last-name) and inherit the attribute properties

The properties of the value are defined on the attribute level such as:

• the type (data type) that constrains the values.
• the domain that define a set of permitted values
• …