Data-Management-Foundations考古題分享 & Data-Management-Foundations認證考試解析

作為IT認證的一項重要考試，WGU Data-Management-Foundations認證資格可以給你帶來巨大的好處，所有請把握這次可以成功的機會。為了能順利通過考試，持有完全版的WGU Data-Management-Foundations題庫資料是必要的，你就能輕松通過想要的認證考試。此外，Testpdf提供的所有考古題都是最新的，其中PDF版本的Data-Management-Foundations題庫支持打打印，方便攜帶，現在就來添加我們最新的Data-Management-Foundations考古題，了解更多的考試資訊吧！

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>> Data-Management-Foundations考古題分享 <<

最新的 Courses and Certificates Data-Management-Foundations 免費考試真題 (Q61-Q66):

問題 #61
Which entity in a table is a measurable object in the real world?

A. Tangible entity
B. Logical entity
C. Virtual entity
D. Conceptual entity

答案：A

解題說明：
Atangible entityis a real-world object that can bemeasured and storedin a database.
Example Usage:
* In an inventory system,tangible entitiesinclude:
Products, Orders, Customers
Why Other Options Are Incorrect:
* Option A (Logical entity) (Incorrect):Exists logically butmay not have a physical presence(e.g., views, categories).
* Option C (Virtual entity) (Incorrect):Existsonly in queries or reports, not stored as real data.
* Option D (Conceptual entity) (Incorrect):Abstract idea used indesign modeling, not astored entity.
Thus, the correct answer isTangible entity, as it representsmeasurable, real-world objects.

問題 #62
Which database operation locates the needed table blocks?

A. Index scan
B. Binary search
C. Table scan
D. Fan-out

答案：A

解題說明：
Anindex scanis a database operation thatquickly locates table blocksusing anindexrather than scanning the entire table. It significantly improves query performance.
Example Usage:
sql
SELECT * FROM Employees WHERE EmployeeID = 105;
* If EmployeeID isindexed, the database uses anindex scantoquickly find the record.
Why Other Options Are Incorrect:
* Option A (Binary search) (Incorrect):A searching algorithm, but not a database operation.
* Option B (Table scan) (Incorrect):Scans theentire table, which isslowerthan an index scan.
* Option C (Fan-out) (Incorrect):Refers tobranching in B-Treesbut doesnot locate table blocks directly.
Thus, the correct answer isIndex scan, as it efficiently locates table blocks.

問題 #63
How is the primary key indicated in a table?

A. By using a diamond symbol inserted into the table
B. By using a formula in SQL
C. By using an SQL keyword
D. By using bold typeface in the appropriate column

答案：C

解題說明：
In SQL, aprimary key is explicitly defined using the PRIMARY KEY keywordwhen creating a table.
Example Usage:
sql
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
Name VARCHAR(100),
Price DECIMAL(10,2)
);
* Here,PRIMARY KEY is the SQL keyword that designates ProductID as the primary key.
Why Other Options Are Incorrect:
* Option A (Formula in SQL) (Incorrect):SQLdoes not use formulas to define primary keys.
* Option C (Bold typeface) (Incorrect):SQL syntax does not rely on text formatting.
* Option D (Diamond symbol) (Incorrect):ER diagramsmight use symbols, but SQLdoes not use diamonds to indicate keys.
Thus, the correct answer isSQL keyword, as primary keys are explicitly defined using PRIMARY KEY.

問題 #64
Which object relates an entity to itself in an entity-relationship model?

A. Relationship instance
B. Repository
C. Reflexive relationship
D. Attribute

答案：C

解題說明：
Areflexive relationship(also called aunary relationship) occurs when anentity is related to itself.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* ManagerIDrefers to another employeewithin the same table.
Why Other Options Are Incorrect:
* Option A (Repository) (Incorrect):A data storage structure, not a relationship type.
* Option B (Relationship instance) (Incorrect):Describesa specific connection between entities, not a reflexive relationship.
* Option D (Attribute) (Incorrect):Attributes storecharacteristics, butdo not define relationships.
Thus, the correct answer isReflexive relationship, as it relates an entity to itself.

問題 #65
Which primary key values consist of a single field only?

A. Simple
B. Partition
C. Meaningless
D. Stable

答案：A

解題說明：
Asimple primary keyconsists ofonly one columnthat uniquely identifies each row in a table.
Example Usage:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* StudentIDis asimple primary keybecause it consists of only one field.
Why Other Options Are Incorrect:
* Option B (Partition) (Incorrect):Refers topartitioned tables, which divide data for performance reasons butare not related to primary keys.
* Option C (Stable) (Incorrect):This is not a recognized term in database keys.
* Option D (Meaningless) (Incorrect):Primary keys are oftenmeaningless (e.g., auto-incremented IDs)
, but this isnot a term used to describe their structure.
Thus, the correct answer isSimple, as asingle-field primary keyis referred to as asimple primary key.

問題 #66
......

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Data-Management-Foundations考古題分享 & Data-Management-Foundations認證考試解析

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最新的 Courses and Certificates Data-Management-Foundations 免費考試真題 (Q61-Q66):

有效的Data-Management-Foundations考古題分享和資格考試中的主要材料供應商和熱門的Data-Management-Foundations認證考試解析