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WGU Data Management – Foundations Exam Sample Questions (Q39-Q44):

NEW QUESTION # 39
What is information independence?

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

Answer: B

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 # 40
Which primary key values consist of a single field only?

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

Answer: A

Explanation:
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.

NEW QUESTION # 41
Which expression can be used to create a temporary name for a table?

A. HAVING
B. UNION
C. NEW
D. ALIAS

Answer: D

Explanation:
Analiasis used in SQL to give atemporaryname to a table or column within a query. It makes queries more readable and helps in cases where a table needs to be referenced multiple times (e.g., in aself-join).
Example Usage:
sql
SELECT e.Name, d.DepartmentName
FROM Employees AS e
JOIN Departments AS d
ON e.DeptID = d.ID;
* Here,Employees is aliased as eandDepartments as d, making the query shorter and clearer.
Why Other Options Are Incorrect:
* Option A (HAVING) (Incorrect):Used to filter grouped results, not create aliases.
* Option B (NEW) (Incorrect):Not a valid SQL keyword for aliasing.
* Option D (UNION) (Incorrect):Combines result sets but does not rename tables.
Thus, the correct answer isALIAS, which allows fortemporary naming of tables or columns.

NEW QUESTION # 42
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

A. WHERE
B. VALUE
C. TABLE
D. FROM

Answer: D

Explanation:
InSQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.
Example:
sql
SELECT name, salary FROM Employees;
* Option A (Correct):The FROM clauseimmediately followsthe SELECT clause in MySQL.
* Option B (Incorrect):VALUE is not a valid clause in MySQL SELECT statements.
* Option C (Incorrect):WHERE is used to filter recordsafter specifying the table in FROM.
* Option D (Incorrect):TABLE is not a valid clause following SELECT in SQL.

NEW QUESTION # 43
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. JOIN VIEWS
C. MATERIALIZED VIEW
D. WITH CHECK OPTION

Answer: D

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 # 44
......

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Quiz Accurate WGU - Data-Management-Foundations - WGU Data Management–Foundations Exam Relevant Exam Dumps

2025 WGU Perfect Data-Management-Foundations Relevant Exam Dumps

WGU Data Management – Foundations Exam Sample Questions (Q39-Q44):

2025 Data-Management-Foundations – 100% Free Relevant Exam Dumps | the Best Data-Management-Foundations Actual Test Pdf

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