LATEST RELEASED WGU DATA-MANAGEMENT-FOUNDATIONS EXAM TOPICS PDF: WGU DATA MANAGEMENT–FOUNDATIONS EXAM - DATA-MANAGEMENT-FOUNDATIONS EXAM OVERVIEW

Latest Released WGU Data-Management-Foundations Exam Topics Pdf: WGU Data Management–Foundations Exam - Data-Management-Foundations Exam Overview

Latest Released WGU Data-Management-Foundations Exam Topics Pdf: WGU Data Management–Foundations Exam - Data-Management-Foundations Exam Overview

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Tags: Data-Management-Foundations Exam Topics Pdf, Data-Management-Foundations Exam Overview, Authorized Data-Management-Foundations Test Dumps, New Data-Management-Foundations Test Experience, Training Data-Management-Foundations Online

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Data-Management-Foundations Exam Overview, Authorized Data-Management-Foundations Test Dumps

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WGU Data Management – Foundations Exam Sample Questions (Q21-Q26):

NEW QUESTION # 21
Which optional clause is used to reject inserts and updates that do not satisfy the WHERE clause of a view query?

  • A. BASE TABLE
  • B. WITH CHECK OPTION
  • C. MATERIALIZED VIEW
  • D. JOIN VIEWS

Answer: B

Explanation:
When a VIEW is created in SQL, users mayinsert or updatedata through that view. However, if a row is inserted or updated in such a way that itviolates the conditionof the VIEW's WHERE clause, it can lead to inconsistencies.
Topreventsuch unwanted modifications,SQL provides the WITH CHECK OPTION clause.
How WITH CHECK OPTION Works:
* Ensures thatany new data (INSERT/UPDATE) still fits within the defined constraints of the VIEW.
* If a user tries to insert or update a row that would not appear in the VIEW,the operation isrejected.
Example:
sql
CREATE VIEW HighSalaryEmployees AS
SELECT * FROM Employees WHERE Salary > 50000
WITH CHECK OPTION;
Now, if someone attempts:
sql
INSERT INTO HighSalaryEmployees (ID, Name, Salary)
VALUES (101, 'Alice', 30000);
Thisfailsbecause 30000 does not satisfy Salary > 50000.
Why Other Options Are Incorrect:
* Option B (Incorrect):JOIN VIEWS isnot a valid SQL clause.
* Option C (Incorrect):MATERIALIZED VIEW refers tostored viewsin some databases, but it doesnot reject incorrect inserts/updates.
* Option D (Incorrect):BASE TABLE refers to theoriginal table from which a VIEW is created.
Thus, the correct answer is WITH CHECK OPTION, whichensures that only valid data modifications occur.


NEW QUESTION # 22
What is information independence?

  • A. An ability to interchange databases
  • B. An ability to make changes to existing queries
  • C. An ability to change database type
  • D. An ability to change the organization of data

Answer: D

Explanation:
Information independencerefers to theseparation between data storage and data access. It allows a database'slogical structureto be modifiedwithout affecting existing applications.
Types of Information Independence:
* Logical Data Independence# Ability to change theconceptual schema(e.g., renaming columns, adding new attributes)without modifying applications.
* Physical Data Independence# Ability to change thephysical storage structure(e.g., indexing, partitioning)without affecting queries.
Example of Logical Data Independence:
* Anew columnis added to the Customers table, but existing queriesstill work without modification.
Example of Physical Data Independence:
* Data is moved to SSD storagefor performance improvement, but queriesrun the same way.
Why Other Options Are Incorrect:
* Option A (Incorrect):Changing thedatabase type(e.g., MySQL to PostgreSQL) isnotinformation independence.
* Option B (Incorrect):Making changes toqueriesis unrelated to database independence.
* Option C (Incorrect):Interchanging databases is related todata portability, notinformation independence.
Thus, the correct answer isD - An ability to change the organization of data, asinformation independence ensuresmodifications do not disrupt database operations.


NEW QUESTION # 23
Which operator defines the field that the index is using in a CREATE TABLE statement?

  • A. ON
  • B. IN
  • C. CHECK
  • D. UNIQUE

Answer: A

Explanation:
TheONkeyword specifies the field used by anindexwhen creating it in SQL.
Example Usage:
sql
CREATE INDEX idx_employee_name
ON Employees(Name);
* Here, an indexidx_employee_nameis createdon the Name column.
* Thisimproves query performancewhen filtering by Name.
Why Other Options Are Incorrect:
* Option B (IN) (Incorrect):Used in queries to match values in a set, not for indexing.
* Option C (UNIQUE) (Incorrect):Ensures a column has unique values but doesnot define an index field.
* Option D (CHECK) (Incorrect):Used forvalidating column values, not for indexing.
Thus, the correct answer isON, as it defines thecolumn on which an index is created.


NEW QUESTION # 24
Which constraint propagates primary key changes to foreign keys?

  • A. SET DEFAULT
  • B. SET NULL
  • C. RESTRICT
  • D. CASCADE

Answer: D

Explanation:
TheCASCADEconstraint ensures thatupdates or deletions in the primary key table automatically reflect in the foreign key 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) ON UPDATE CASCADE ON DELETE CASCADE );
* If DeptIDchangesin Departments, itautomatically updatesin Employees.
* If a DeptID isdeleted, all employees in that departmentare also deleted.
Why Other Options Are Incorrect:
* Option A (SET DEFAULT) (Incorrect):Sets foreign key values to adefaultvalue, rather than propagating changes.
* Option B (SET NULL) (Incorrect):When the referenced key is deleted, dependent records areset to NULLinstead of being updated/deleted.
* Option C (RESTRICT) (Incorrect):Prevents deletion of a referenced row if dependent foreign key rows exist.
Thus, the correct answer isCASCADE, as itpropagates primary key changes to dependent foreign keys.


NEW QUESTION # 25
What is the role of the database administrator?

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

Answer: B

Explanation:
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.


NEW QUESTION # 26
......

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