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Free PDF Fantastic WGU - Data-Management-Foundations - Reliable WGU Data Management–Foundations Exam Learning Materials

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WGU Data Management – Foundations Exam Sample Questions (Q60-Q65):

NEW QUESTION # 60
Which entity in a table is a measurable object in the real world?

A. Tangible entity
B. Logical entity
C. Conceptual entity
D. Virtual entity

Answer: A

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 # 61
Which type of join selects all the rows from both the left and right table, regardless of match?

A. Inner Join
B. Outer Join
C. Cross Join
D. Full Join

Answer: D

Explanation:
AFull Join (FULL OUTER JOIN)selectsall records from both tables, filling in NULL values where there is no match. This ensures that no data is lost from either table.
Example Usage:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
FULL OUTER JOIN Departments ON Employees.DeptID = Departments.ID;
* This query retrievesall employees and all departments, even if an employeehas no assigned departmentor a departmenthas no employees.
Types of Joins:
* FULL OUTER JOIN (Correct Answer)# Includesall rows from both tables, filling missing values with NULL.
* LEFT JOIN (Incorrect)# Includesall rows from the left tableandmatching rows from the right table.
* RIGHT JOIN (Incorrect)# Includesall rows from the right tableandmatching rows from the left table.
* CROSS JOIN (Incorrect)# Produces aCartesian product(each row from one table is combined with every row from another table).
Thus, the correct answer isFULL JOIN, whichensures that all rows from both tables appear in the result.

NEW QUESTION # 62
Which syntax feature classifies the explicit string, numeric, or binary values used in SQL queries?

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

Answer: D

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 # 63
Which designation is an individual value, such as a salary?

A. Entity type
B. Attribute type
C. Relationship
D. Glossary

Answer: B

Explanation:
Anattribute typerefers to asingle, specific valuewithin a table, such as Salary, Age, or Price.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* Salary is anattribute typewith individual values for each employee.
Why Other Options Are Incorrect:
* Option A (Glossary) (Incorrect):Refers todocumentation, not database values.
* Option B (Entity type) (Incorrect):Representsa class of objects(e.g., Employees), not individual values.
* Option D (Relationship) (Incorrect):Definesconnections between entities, not attributes.
Thus, the correct answer isAttribute type, as it represents anindividual data value.

NEW QUESTION # 64
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 # 65
......

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