100% PASS QUIZ 2025 RELIABLE WGU COMPLETE DATA-MANAGEMENT-FOUNDATIONS EXAM DUMPS

100% Pass Quiz 2025 Reliable WGU Complete Data-Management-Foundations Exam Dumps

100% Pass Quiz 2025 Reliable WGU Complete Data-Management-Foundations Exam Dumps

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WGU Data Management – Foundations Exam Sample Questions (Q18-Q23):

NEW QUESTION # 18
Which syntax feature classifies the explicit string, numeric, or binary values used in SQL queries?

  • A. Comments
  • B. Literals
  • C. Identifiers
  • D. Keywords

Answer: B

Explanation:
In SQL,literalsrepresent explicit values such asnumbers, strings, or binary datadirectly written into queries.
For example:
SELECT * FROM Employees WHERE Salary > 50000;
Here, 50000 is anumeric literal.
* Option A (Correct):Literalsare explicit values used in SQL queries, such as 123, 'John Doe', and TRUE.
* Option B (Incorrect):Commentsare non-executable text used for documentation within SQL code, typically denoted by -- or /* ... */.
* Option C (Incorrect):Identifiersare names oftables, columns, or other database objects, such as EmployeeID.
* Option D (Incorrect):Keywordsare reserved words in SQL (e.g., SELECT, FROM, WHERE) that define operations and syntax.


NEW QUESTION # 19
Which keyword can be used to combine two results into one table?

  • A. UNION
  • B. CONSOLIDATE
  • C. INTEGRATE
  • D. MERGE

Answer: A

Explanation:
TheUNIONkeyword in SQL is used tocombine the resultsof two or more SELECT queries into asingle result setwhile removing duplicate rows.
Example:
sql
SELECT Name FROM Employees
UNION
SELECT Name FROM Managers;
* Option A (Correct):UNION combines results from multiple queries into one set,removing duplicates.
* Option B (Incorrect):MERGE is not a valid SQL keyword for combining result sets (it is used insome database systems for data merging).
* Option C (Incorrect):INTEGRATE is not a SQL keyword.
* Option D (Incorrect):CONSOLIDATE is not an SQL keyword.


NEW QUESTION # 20
What is the role of the transaction manager within the database system architecture?

  • A. The transaction manager uses information from the catalog to perform query optimization.
  • B. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
  • C. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
  • D. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.

Answer: C


NEW QUESTION # 21
Which clause is used to specify the join columns when performing a join in MySQL?

  • A. AS
  • B. AND
  • C. JOIN
  • D. ON

Answer: D

Explanation:
When performing aJOIN operationin MySQL, the ON clause specifies thejoining condition, defining which columns from both tables should be matched.
Example:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
JOIN Departments ON Employees.DepartmentID = Departments.ID;
* Option A (Incorrect):AS is used foraliasing tables and columns, not for specifying join conditions.
* Option B (Incorrect):JOIN defines the type of join (INNER JOIN, LEFT JOIN, etc.), butdoes not specify the columns.
* Option C (Correct):The ON clause is used tospecify the join conditionbetween two tables.
* Option D (Incorrect):AND is used in filtering conditions, not for joining tables.


NEW QUESTION # 22
Which relationship exists between occurrences of the same entity types?

  • A. Modality
  • B. Unary
  • C. Binary
  • D. Cardinality

Answer: B

Explanation:
Aunary relationship(also known as arecursive relationship) occurs when an entityrelates to itself.
Example Usage:
* Employees and Managers:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
FOREIGN KEY (ManagerID) REFERENCES Employees(EmpID)
);
* Here, ManagerIDreferences another Employee# aunary (self-referential) relationship.
Why Other Options Are Incorrect:
* Option A (Modality) (Incorrect):Describesoptional vs. mandatoryrelationships, not self-referencing.
* Option C (Cardinality) (Incorrect):Defines how many instances relate,not the type of relationship.
* Option D (Binary) (Incorrect):Binary relationships involvetwo different entities, not self-referencing.
Thus, the correct answer isUnary, as it describesrelationships within the same entity type.


NEW QUESTION # 23
......

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