Categories of Business Rules
It will be easier for you to understand and define business rules if you divide them into two distinct categories: field specific and relationship specific.
Field Specific Business Rules
Business rules under this category impose constraints on the elements of a field specification for a particular field. The number of elements a given rule affects depends on the manner in which you define that rule. For example, this rule only affects one element:
Order dates are to be displayed in long form, such as “January 10, 2003.”
This rule affects the Display Format element of the ORDER DATE field in an ORDERS table. You establish this rule by modifying the Display Format element of the field specifications for the ...
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