100% PASS QUIZ 2025 HIGH HIT-RATE DATA-MANAGEMENT-FOUNDATIONS: WGU DATA MANAGEMENT–FOUNDATIONS EXAM EXAM ACTUAL QUESTIONS

100% Pass Quiz 2025 High Hit-Rate Data-Management-Foundations: WGU Data Management–Foundations Exam Exam Actual Questions

100% Pass Quiz 2025 High Hit-Rate Data-Management-Foundations: WGU Data Management–Foundations Exam Exam Actual Questions

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WGU Data Management – Foundations Exam Sample Questions (Q17-Q22):

NEW QUESTION # 17
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 # 18
Which main characteristic is used to differentiate between strong and weak entities in the process of database design?

  • A. Cardinality
  • B. Primary key
  • C. Association
  • D. Foreign key

Answer: B

Explanation:
Indatabase design, an entity is classified asstrong or weakbased on whether it has aprimary keythat uniquely identifies its records.
Differences Between Strong and Weak Entities:

CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT
);
CREATE TABLE OrderDetails (
OrderDetailID INT,
OrderID INT,
ProductID INT,
PRIMARY KEY (OrderDetailID, OrderID),
FOREIGN KEY (OrderID) REFERENCES Orders(OrderID)
);
* Orders is astrong entity(has OrderID as its own primary key).
* OrderDetails is aweak entity(depends on OrderID for uniqueness).
Why Other Options Are Incorrect:
* Option A (Association) (Incorrect):Associations describerelationshipsbut do not define strong/weak entities.
* Option C (Foreign key) (Incorrect):Weak entitiesdepend on foreign keys, butprimary keysdefine their status.
* Option D (Cardinality) (Incorrect):Cardinality definesrelationship constraintsbut doesnot differentiate entity types.
Thus, the correct answer isPrimary key, as it is the defining characteristic betweenstrong and weak entities.


NEW QUESTION # 19
Which term defines a column, or group of columns, that refers to a primary key in a different table?

  • A. Simple key
  • B. Super key
  • C. Composite key
  • D. Foreign key

Answer: D

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 # 20
Which relationship is shown in the following diagram?

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

Answer: D

Explanation:
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.


NEW QUESTION # 21
Which type of join is demonstrated by the following query?
sql
SELECT *
FROM Make, Model
WHERE Make.ModelID = Model.ID;

  • A. NON-EQUIJOIN
  • B. CROSS JOIN
  • C. EQUIJOIN
  • D. SELF JOIN

Answer: C

Explanation:
This query performs ajoin operationwhere records from the Make table and Model table are combined based on the condition Make.ModelID = Model.ID. This conditiontests for equality, which is the definition of an EQUIJOIN.
Types of Joins in SQL:
* EQUIJOIN (Correct Answer):
* Uses an equality operator (=) to match rows between tables.
* Equivalent to an INNER JOIN ON condition.
* Example:
sql
SELECT *
FROM Employees
JOIN Departments ON Employees.DeptID = Departments.ID;
* NON-EQUIJOIN (Incorrect):
* Usescomparison operators other than =(e.g., <, >, BETWEEN).
* Example:
sql
SELECT *
FROM Employees e
JOIN Salaries s ON e.Salary > s.MedianSalary;
* SELF JOIN (Incorrect):
* A table is joined withitselfusing table aliases.
* Example:
sql
SELECT e1.Name, e2.Name AS Manager
FROM Employees e1
JOIN Employees e2 ON e1.ManagerID = e2.ID;
* CROSS JOIN (Incorrect):
* ProducesCartesian product(each row from Table A combines with every row from Table B).
* Example:
sql
SELECT *
FROM Employees
CROSS JOIN Departments;
Thus, since our given query uses anequality condition (=) to join two tables, it is anEQUIJOIN.


NEW QUESTION # 22
......

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