FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 8: Data Modeling Advanced Concepts

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 41

True/False

Review LaterAdd Note

Review Later

Implementing non-overlapping subtypes requires the use of one discriminator attribute for each subtype.

A) True
B) False

Correct Answer

verified

Show Answer

Question 42

Multiple Choice

Review LaterAdd Note

Review Later

A(n) ____ is the attribute in the supertype entity that determines to which entity subtype each supertype occurrence is related.

A) subtype discriminator
B) inheritance discriminator
C) specialization hierarchy
D) entity supertype

E) None of the above
F) A) and B)

Correct Answer

verified

Show Answer

Question 43

Short Answer

Review LaterAdd Note

Disjoint subtypes are also known as ____________________ subtypes.

An entity cluster is considered "virtual" or "____________________" in the sense that it is not actually an entity in the final ERD.

Describe specialization and generalization.

Within a specialization hierarchy, a supertype can exist only within the context of a subtype.

____ data refer to data whose values change over time and for which you must keep a history of the data changes.

At the implementation level, the supertype and its subtype(s) depicted in the specialization hierarchy maintain a(n) ____ relationship.

Entity subtypes do not inherit the relationships in which the supertype entity participates.

The default comparison condition for the subtype discriminator attribute is the ____ comparison.