RelationalDBDesign
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Database Design Strategy
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Design Subject
Application Approach Design
Schema Architecture
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DBLC Design Stages
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Requirements Analysis
Requirements Analysis
Define Business Objects
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Business Rules Importance
Interview Data Users
Data Flow Diagram
Creating User Views
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Attributes and Entities
Entities Conceptual Model
Store Entity Values
Rules for Creating Identifiers
Entity Instances
Attribute Domains Types
Multivalued Attribute
Multi-Valued Attributes
Multivalued Attribute(resolve)
Entity Attribute Constraints
Module Summary
ER Diagrams
ERD Concept
Three Relationship Types
One to One Relationships
Identify one To One
One to many Relationships
Identify One to Many
Define many To Many
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Many to Many Challenges
Convert m:n to 1:n
Mandatory Optional Relationship
Optional Participation Relationships
ERD Conclusion
ERD Conventions
ER Diagram
Three Model Types
idef1x Crowsfoot Chen Models
Entity Attribute Relationship
ER Diagram Types
Crow's Foot Notation
DB Participation Types
Interview End- Users
Verbalize ER Diagram
ER diagram model Types
Relational Database Design Strategy - Quiz Results
The answers you selected are indicated below, along with text that explains the correct answers.
1.
Which of the following is under the control of the database designer?
Please select the best answer.
A.
Achieving database security
B.
Eliminating duplicate data
C.
Enforcing database integrity
The correct answer is B.
The process of eliminating duplicate data in a database is the province of the database designer. A is incorrect because database security depends on the RDBMS and NOS and is therefore outside the control of the designer. C is incorrect because enforcing database integrity is a function of the RDBMS.
2.
Which of the following is true regarding the application approach to database design?
Please select the best answer.
A.
The application approach represents a bottom-up approach to database design.
B.
In the application approach, databases are created for each subject area.
C.
The application approach represents a top-down approach to database design.
D.
The application approach groups business objects by subject.
The correct answer is A.
The application approach represents a bottom-up approach to database design because an application approach focuses on how data are presented, rather than the characteristics of the data itself. B is incorrect because concerns about subject area characterize the subject approach. C is incorrect because the top-down approach focuses on how data are organized, which is characteristic of the subject approach, not the application approach. D is incorrect because concerns about subject area characterize the subject approach.
3.
Which of the following describes the logical schema?
Please select all the correct answers.
A.
It involves systems programmers.
B.
It creates a logical plan.
C.
It describes how data are linked.
D.
It involves database designers.
The correct answers are B, C, and D.
The logical schema creates a logical plan; it describes how data are linked; and it involves database designers. A is incorrect because systems programmers are involved in the physical schema, not the logical schema.
4.
Which of the following capabilities are present in some, if not all, CASE tools?
Please select all the correct answers.
A.
The ability to create an ER diagram
B.
The ability to convert an ER diagram into SQL tables
C.
The ability to examine and analyze a database environment
D.
The ability to create a data flow diagram
The correct answers are A, B, and D.
Some, if not all, CASE tools have the ability to create an ER (entity relationship) diagram, convert an ER diagram into SQL tables, and create a data flow diagram. C is incorrect because CASE tools assist database designers, they don’t replace designers. And only a designer has the ability to examine and analyze a database environment.
5.
Which of the following tasks is associated with Logical Design?
Please select the best answer.
A.
Adding and deleting records
B.
Tweaking database performance
C.
Normalizing database tables
D.
Assessing the informational needs of an organization
The correct answer is C.
Creating a conceptual model and normalizing tables to resolve database design problems are two primary tasks in the logical-design stage. A is incorrect because adding and deleting records is part of the monitoring, modification, and maintenance stage. B is incorrect because tweaking database performance is associated with the physical-design stage. D is incorrect because assessing the informational needs of an organization is a task performed during requirements analysis.
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