VALID DATA-MANAGEMENT-FOUNDATIONS EXAM PRACTICE MATERIAL: WGU DATA MANAGEMENT–FOUNDATIONS EXAM AND TRAINING STUDY GUIDE - VCEENGINE

Valid Data-Management-Foundations Exam Practice Material: WGU Data Management–Foundations Exam and Training Study Guide - VCEEngine

Valid Data-Management-Foundations Exam Practice Material: WGU Data Management–Foundations Exam and Training Study Guide - VCEEngine

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WGU Data Management – Foundations Exam Sample Questions (Q15-Q20):

NEW QUESTION # 15
Which expression can be used to create a temporary name for a table?

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

Answer: A

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 # 16
Which keyword or clause indicates the desired sequence when displaying a set of records returned from a SELECT statement?

  • A. ORDER BY
  • B. BETWEEN
  • C. LIKE
  • D. DISTINCT

Answer: A

Explanation:
TheORDER BYclause in SQL is used tosort query resultsinascending (ASC) or descending (DESC) order
.
Example Usage:
sql
SELECT Name, Salary FROM Employees ORDER BY Salary DESC;
* This retrieves all employees, sorted bysalary in descending order.
Why Other Options Are Incorrect:
* Option A (BETWEEN) (Incorrect):Used for filtering ranges butdoes not order results.
* Option B (DISTINCT) (Incorrect):Removes duplicate rows butdoes not control order.
* Option D (LIKE) (Incorrect):Used forpattern matching, not sorting.
Thus,ORDER BY is the correct choicefor defining the sequence of query results.


NEW QUESTION # 17
Which function is considered an aggregate function?

  • A. ABS
  • B. TRIM
  • C. DESC
  • D. MAX

Answer: D

Explanation:
Aggregate functionsperform calculationson a set of values and return asingle result.MAX()is one such function, returning thelargest value in a column.
Common Aggregate Functions:
A screenshot of a computer AI-generated content may be incorrect.

Example Usage:
sql
SELECT MAX(Salary) FROM Employees;
* Retrieves thehighest salaryin the Employees table.
Why Other Options Are Incorrect:
* Option B (TRIM) (Incorrect):Removes spaces from strings butis not an aggregate function.
* Option C (ABS) (Incorrect):Returns theabsolute value of a numberbut doesnot aggregate multiple rows.
* Option D (DESC) (Incorrect):Used in ORDER BY forsorting in descending order,not for aggregation.
Thus, the correct answer isMAX(), as it is atrue aggregate function.


NEW QUESTION # 18
Which property is associated with a one-field primary key?

  • A. Duplicate
  • B. Simple
  • C. Numeric
  • D. Composite

Answer: B

Explanation:
Aprimary keyuniquely identifies each row in a table. When a primary key consists ofonly one field, it is called aSimple Primary Key.
Types of Primary Keys:
* Simple Primary Key (Correct Answer):
* Contains onlyone column.
* Example:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* Composite Primary Key:
* Usesmultiple columnsto ensure uniqueness.
* Example:
sql
CREATE TABLE Orders (
OrderID INT,
ProductID INT,
PRIMARY KEY (OrderID, ProductID)
);
* Surrogate Primary Key:
* A system-generatedunique identifier(e.g., UUID or AUTO_INCREMENT).
Why Other Options Are Incorrect:
* Option B (Duplicate) (Incorrect):A primary keymust be unique, so itcannot be duplicate.
* Option C (Numeric) (Incorrect):While primary keyscan be numeric, they can also be alphanumeric (VARCHAR).
* Option D (Composite) (Incorrect):Acompositekey consists ofmultiple fields, whereas a simple key is a single field.
Thus, the correct answer isSimple, since aone-field primary keyis a simple primary key.


NEW QUESTION # 19
What is the role of the database administrator?

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

Answer: D

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 # 20
......

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