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Database Design Chapter 2 Data Models With Complete Solutions Latest Update
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Database Design Chapter 2 Data Models With Complete Solutions Latest Update
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Database Design Chapter 2 Data Models WithComplete Solutions Latest Update
Data modeling - correct answers Iterative and progressive process of creating a
specific data model for a determined problem domain.
Data models - correct answers Simple representations of complex real-world data
structures. Useful for supporting a specific problem domain.
Model - correct answers Abstraction of a real-world object or event.
Importance of data models - correct answers Are a communication tool, give
overall view of the database, organize data for various users, are an abstraction for
the creation of good database.
Entity - correct answers Unique and distinct object used to collect and store data.
Attribute - correct answers Characteristics of an entity.
Relationship - correct answers Describes an association among entities. One-to-
many, many-to-many, one-to-one.
Constraint - correct answers Set of rules to ensure data integrity.
, Business rules - correct answers Brief, precise, and unambiguous description of a
policy, procedure, or principle. Enable defining the basic building blocks. Describe
main and distinguishing characteristics of the data.
Sources of business rules - correct answers Company managers, policy makers,
department managers, written documentation, direct interviews with end users.
Reasons for identifying and documenting business rules - correct answers Help
standardize company's view of data. Communications tool between users and
designs.
Business rules allow designer to: - correct answers Understand nature, role, scope
of data, and business processes. Develop appropriate relationship participation
rules and constraints. Create an accurate data model.
Translating business rules into data model components - correct answers Nouns
translate into entities. Verbs translate into relationships among entities.
Relationships are bidirectional.
Questions to identify the relationship type - correct answers How many instances
of B are related to one instance of A?
How many instances of A are related to one instance of B?
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