Data-Management-Foundations考試指南，Data-Management-Foundations考試內容

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>> Data-Management-Foundations考試指南 <<

一流的Data-Management-Foundations考試指南 |第一次嘗試輕鬆學習並通過考試＆頂級的WGU WGU Data Management – Foundations Exam

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最新的 Courses and Certificates Data-Management-Foundations 免費考試真題 (Q36-Q41):

問題 #36
What is shown on the "many" side of a relationship between two tables?

A. Reflexive relationship
B. Foreign key
C. Weak entity
D. Binary relationship

答案：B

解題說明：
In aone-to-many (1:M) relationship, theforeign keyis placed in thetable on the "many" sideto establish the relationship with theprimary keyof the "one" side.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Departments (
DeptID INT PRIMARY KEY,
DeptName VARCHAR(50)
);
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
DeptID INT, -- Foreign key on the "many" side
FOREIGN KEY (DeptID) REFERENCES Departments(DeptID)
);
* Eachdepartmentcan havemany employees# DeptID is aforeign keyin Employees.
Why Other Options Are Incorrect:
* Option A (Reflexive relationship) (Incorrect):Refers tounary (self-referential) relationships, not 1:
M relationships.
* Option B (Binary relationship) (Incorrect):A binary relationship involvestwo entities, but does not define where the foreign key is stored.
* Option C (Weak entity) (Incorrect):Weak entitiesdepend on a strong entity, but not all "many" sides are weak entities.
Thus, the correct answer isForeign key, as it is placed on the "many" side of the relationship.

問題 #37
Which phase of entity-relationship modeling refers to the maxima and minima of relationships and attributes?

A. Attribute minimum
B. Cardinality
C. Partition
D. Physical design

答案：B

解題說明：
Cardinalitydefines theminimum and maximum number of occurrencesof one entity in relation to another.
Example Usage in an ER Model:
* One-to-Many (1:M): Acustomer can place multiple orders, but each order belongs to onlyone customer.
Customers (1) --- (M) Orders
* Cardinality notation:
(1,1) # One-to-One
(0,M) # Zero-to-Many
(1,M) # One-to-Many
Why Other Options Are Incorrect:
* Option B (Physical design) (Incorrect):Focuses onstorage and indexing, not relationships.
* Option C (Attribute minimum) (Incorrect):No such formal term in database modeling.
* Option D (Partition) (Incorrect):Refers todividing tables, not relationship constraints.
Thus, the correct answer isCardinality, as it definesmin/max constraints on relationships.

問題 #38
What does the aggregate function do?

A. It selects rows that appear in one table but not another.
B. It eliminates one or more columns of a table.
C. It lists combinations of rows in two tables.
D. It computes values over a set of rows.

答案：D

解題說明：
Anaggregate functionperforms acalculation over multiple rowsand returns asingle value. Examples include SUM(), AVG(), MAX(), MIN(), and COUNT()in SQL.
* Option A (Correct):Aggregate functions compute values over aset of rows, like summingtotal sales or averaging grades.
* Option B (Incorrect):Selecting rows that appear in one table but not another is done usingset operations (EXCEPT or MINUS in SQL).
* Option C (Incorrect):Eliminating columns is done using thePROJECToperation orSELECT with specific columns.
* Option D (Incorrect):Combining rows from two tables refers to aJOIN operation, not aggregation.

問題 #39
Which relationship is shown in the following diagram?

A. Unary relationship
B. Associative entity
C. Many-to-many
D. Intersection data

答案：A

解題說明：
The given diagram represents a unary relationship (also called a recursive relationship), which occurs when an entity is related to itself. In this case, salespersons back each other up, meaning a salesperson is associated with another salesperson from the same entity.
Key Observations from the Diagram:
* Single Entity (Salesperson)
* The table contains only one entity type, Salesperson, which has attributes such as Salesperson Number, Name, Commission, Percentage, and Year of Hire.
* Self-Referencing Relationship (Backs-up and Backed-up by)
* The diagram shows that a salesperson can back up another salesperson.
* This means that the relationship exists within the same entity rather than between two different entities.
* Cardinality (One-to-One Relationship in a Unary Form)
* The notation ( |-| ) in the ER diagram indicates a one-to-one recursive relationship.
* One salesperson can back up only one other salesperson, and each salesperson is backed up by only one.

問題 #40
What is the first step of the analysis phase for designing a database?

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

答案：A

解題說明：
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.

問題 #41
......

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