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ER Model and Business Rules
Which of the following statements concerning business rules is true?
It should be complex.
It should not be convertible to computer code.
It may include restrictions.
All of the above.
Correct Answer:
It may include restrictions.
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ER Model and Business Rules
Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.
There is cardinality on an EER between the supertype and subtype.
A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings.
Total specialization is represented by double lines between the supertype and subtype on an EER.
If an entity adheres to the disjoint rule, then an entity instance can be a member of more than one entity for a given supertype.
A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).
A supertype can only have only one subtype.
Packaged data models are meant to be exactly right straight out of the box.
It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.
Action assertions have traditionally been implemented within an application program.
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