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WGU Data Management – Foundations Exam 認定 Data-Management-Foundations 試験問題 (Q24-Q29):

質問 # 24
Which elements are represented by attributes in the database design documents?

A. Names
B. Repositories
C. Relationships
D. Synonyms

正解：A

解説：
Attributesin a databaserepresent the properties (names, values, or characteristics) of an entity.
Example Usage:
* In aStudentstable, attributes might include:
StudentID (Primary Key), Name, Age, Major
* Here,Name is an attributedescribing the entityStudent.
Why Other Options Are Incorrect:
* Option A (Synonyms) (Incorrect):Synonyms in SQL allow different names for the same object but are not attributes.
* Option C (Repositories) (Incorrect):A repository stores data butdoes not define attributes.
* Option D (Relationships) (Incorrect):Relationships defineconnections between entities, not their attributes.
Thus, the correct answer isNames, asattributes define entity properties.

質問 # 25
Which property is associated with a one-field primary key?

A. Numeric
B. Duplicate
C. Composite
D. Simple

正解：D

解説：
Aprimary keyuniquely identifies each row in a table. When a primary key consists ofonly one field, it is called aSimple Primary Key.
Types of Primary Keys:
* Simple Primary Key (Correct Answer):
* Contains onlyone column.
* Example:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* Composite Primary Key:
* Usesmultiple columnsto ensure uniqueness.
* Example:
sql
CREATE TABLE Orders (
OrderID INT,
ProductID INT,
PRIMARY KEY (OrderID, ProductID)
);
* Surrogate Primary Key:
* A system-generatedunique identifier(e.g., UUID or AUTO_INCREMENT).
Why Other Options Are Incorrect:
* Option B (Duplicate) (Incorrect):A primary keymust be unique, so itcannot be duplicate.
* Option C (Numeric) (Incorrect):While primary keyscan be numeric, they can also be alphanumeric (VARCHAR).
* Option D (Composite) (Incorrect):Acompositekey consists ofmultiple fields, whereas a simple key is a single field.
Thus, the correct answer isSimple, since aone-field primary keyis a simple primary key.

質問 # 26
What is the role of the database administrator?

A. The database administrator determines the format of each data element and the overall database structure.
B. The database administrator is responsible for securing the database system against unauthorized users.
C. The database administrator is a consumer of data in a database.
D. The database administrator develops computer programs that utilize a database.

正解：B

解説：
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.

質問 # 27
What is the second step in the implement relationships stage of database design?

A. Implement one-one relationships
B. Specify cascade
C. Implement subtype entities
D. Implement weak entities

正解：A

解説：
Thesecond step in implementing relationshipsis definingone-to-one (1:1) relationshipsbetween entities.
Example Usage:
* Example of a 1:1 relationship:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE EmployeeDetails (
EmpID INT PRIMARY KEY,
Address VARCHAR(255),
FOREIGN KEY (EmpID) REFERENCES Employees(EmpID)
);
* Here, eachemployee has exactly one detail record, creating a1:1 relationship.
Why Other Options Are Incorrect:
* Option A (Implement weak entities) (Incorrect):Weak entities rely on aforeign keyand are implementedlater.
* Option C (Implement subtype entities) (Incorrect):Subtypes arespecial casesandnot implemented in the second step.
* Option D (Specify cascade) (Incorrect):Cascade rules (ON DELETE, ON UPDATE)are defined duringforeign key implementation, not in the second step.
Thus, the correct answer isImplement one-one relationships, as it is thenext logical stepafter defining entities.

質問 # 28
What is the first step of the analysis phase for designing a database?

A. Implement attributes
B. Determine cardinality
C. Draw an entity-relationship (ER) diagram
D. Identify entities

正解：D

解説：
Thefirst stepin database analysis isidentifying entities, which are thereal-world objectsthat need to be represented in the database.
Example Usage:
* In a school system, the mainentitiescould be:
Students, Courses, Instructors
Why Other Options Are Incorrect:
* Option A (Determine cardinality) (Incorrect):Determining relationships comesafteridentifying entities.
* Option C (Draw an ER diagram) (Incorrect):ER diagramsvisualizeentities but arenot the first step.
* Option D (Implement attributes) (Incorrect):Attributes aredefined afterentities are identified.
Thus, the correct answer isIdentify entities, asentities form the foundation of the databasemodel.

質問 # 29
......

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大丈夫ですよ、もちろん、アンタが誘ってくれんなら、他の男蹴ってでも駆けつけるよ、何事でもはじめが一番難しいです、Data-Management-Foundations学習教材を購入し、しばらくの間辛抱強く学習すれば、わずかな失敗確率でData-Management-Foundationsテストに合格することを保証できます。

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Data-Management-Foundations学習指導はWGU Data Management–Foundations Examに合格するための強力な武器になります

Data-Management-Foundations模擬対策、Data-Management-Foundations学習範囲

WGU Data Management – Foundations Exam 認定 Data-Management-Foundations 試験問題 (Q24-Q29):

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