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WGU Data Management – Foundations Exam Sample Questions (Q38-Q43):
NEW QUESTION # 38
Which term defines a column, or group of columns, that refers to a primary key in a different table?
- A. Composite key
- B. Simple key
- C. Foreign key
- D. Super key
Answer: C
Explanation:
Aforeign keyis a column (or a set of columns) that establishes arelationship between two tablesby referencing theprimary key of another table.
Example Usage:
sql
CREATE TABLE Departments (
DeptID INT PRIMARY KEY,
DeptName VARCHAR(50)
);
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
DeptID INT,
FOREIGN KEY (DeptID) REFERENCES Departments(DeptID)
);
* DeptID in Employees is a foreign key, referencing DeptID in Departments.
* Ensuresreferential integrity# DeptID in Employeesmust existin Departments.
Why Other Options Are Incorrect:
* Option A (Super key) (Incorrect):Asuper keyis any set of columns that uniquely identifies a row, but itdoes not reference another table.
* Option B (Simple key) (Incorrect):Asimple keyis asingle-column primary key, not a reference to another table.
* Option C (Composite key) (Incorrect):Acomposite keyconsists ofmultiple columnsbut does not necessarily reference another table.
Thus, the correct answer isForeign key, as it establishes aconnection between two tables.
NEW QUESTION # 39
What is the first step of the analysis phase for designing a database?
- A. Draw an entity-relationship (ER) diagram
- B. Determine cardinality
- C. Implement attributes
- D. Identify entities
Answer: D
Explanation:
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.
NEW QUESTION # 40
Which entity in a table is a measurable object in the real world?
- A. Logical entity
- B. Tangible entity
- C. Conceptual entity
- D. Virtual entity
Answer: B
Explanation:
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.
NEW QUESTION # 41
Which type of entity only exists in a logical sense?
- A. Intangible entity
- B. Tangible entity
- C. Physical entity
- D. Concrete entity
Answer: A
Explanation:
Anintangible entityis an entity that does not have a physical presence but still holds meaning in a database.
These entities representconcepts, relationships, or abstract datathat exist in a logical sense.
Example Usage in Databases:
* Customer Loyalty Status (Gold, Silver, Bronze)
* Theloyalty levelis anintangible entitysince it is derived from other data (purchase history).
* Online User Sessions
* Asession IDexistslogically in the systembut does not have a tangible presence like a product or employee.
Why Other Options Are Incorrect:
* Option A (Concrete entity) (Incorrect):No such formal term in database design.
* Option B (Tangible entity) (Incorrect):Represents somethingphysical, like anemployeeorproduct.
* Option D (Physical entity) (Incorrect):Refers todata stored on disk, like database tables or indexes.
Thus, the correct answer isIntangible entity, as it only exists in a logical sense within the database.
NEW QUESTION # 42
What is the role of a query processor in the database system architecture?
- A. It sends results back to the application that requested the queries.
- B. It uses information from the catalog to perform query optimization.
- C. It translates instructions into file system commands.
- D. It writes log records before applying changes to the database.
Answer: B
Explanation:
Aquery processoris responsible forquery optimization and executionin a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.
* Option A (Correct):Thequery processoroptimizes queries by analyzing metadata from thesystem catalogto determine the best execution strategy.
* Option B (Incorrect):Logging transactionsbefore applying changes is the responsibility of the transaction manager.
* Option C (Incorrect):Translating instructions intofile system commandsis handled by thestorage manager, not the query processor.
* Option D (Incorrect):While the query processor helps retrieve results, thedatabaseengineandAPI layerare responsible for returning results to applications.
NEW QUESTION # 43
......
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