Desktop-Based WGU Data-Management-Foundations Practice Test

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WGU Data Management – Foundations Exam Sample Questions (Q35-Q40):

NEW QUESTION # 35
Which command is used to filter group results generated by the GROUP BY clause?

A. WITH
B. WHERE
C. HAVING
D. REPLACE

Answer: C

Explanation:
TheHAVINGclause is used in SQL to filtergrouped resultsgenerated by the GROUP BY clause. Unlike WHERE, which filters individual rowsbeforegrouping, HAVING filtersafter aggregationhas been performed.
Example Usage:
sql
SELECT Department, AVG(Salary) AS AvgSalary
FROM Employees
GROUP BY Department
HAVING AVG(Salary) > 50000;
* This query first groups employees by Department, calculates theaverage salary per department, and then filters onlythose departments where the average salary is greater than 50,000.
Why Other Options Are Incorrect:
* Option A (REPLACE) (Incorrect):Used for string substitution, not filtering.
* Option C (WITH) (Incorrect):Used inCommon Table Expressions (CTEs), not for filtering.
* Option D (WHERE) (Incorrect):Used forrow-level filtering before aggregation, but itcannot be used on aggregate functions like SUM() or AVG().
Thus,HAVING is the correct answerfor filtering after grouping.

NEW QUESTION # 36
Where does a primary key traditionally appear in a table?

A. In the top row
B. In the last visible column
C. In the table header
D. In the first column

Answer: D

Explanation:
Bydatabase design conventions, theprimary key is usually placed in the first columnof a table to make it easy to identify and reference.
Example Usage:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY, -- First column (convention)
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* EmpID is placed as the first columnfor clarity and quick access.
Why Other Options Are Incorrect:
* Option A (In the table header) (Incorrect):Table headers onlydisplay column names, they do not contain values.
* Option C (In the top row) (Incorrect):Thetop row contains data, not theprimary key definition.
* Option D (In the last visible column) (Incorrect):While technically possible,placing a primary key at the endisuncommonin database design.
Thus, the correct answer isIn the first column, as this is the standard convention in relational databases.

NEW QUESTION # 37
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 # 38
Which function is considered an aggregate function?

A. DESC
B. TRIM
C. ABS
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 # 39
How can a primary key constraint be added after the table is created?

A. By using an UPDATE clause
B. By using an INSERT INTO clause
C. By using an ALTER clause
D. By using the CREATE TABLE statement

Answer: C

Explanation:
Toadd a primary key constraint after table creation, we use theALTER TABLEstatement.
Example Usage:
sql
ALTER TABLE Employees
ADD CONSTRAINT PK_Employees PRIMARY KEY (EmpID);
* Thisaddsa primary key to the EmpID columnafter the table was created.
Why Other Options Are Incorrect:
* Option B (CREATE TABLE) (Incorrect):Used for defining constraintsduringtable creation, not after.
* Option C (UPDATE) (Incorrect):Modifiesrow values, not constraints.
* Option D (INSERT INTO) (Incorrect):Used toadd datato a table, not modify constraints.
Thus, the correct answer isALTER TABLE, as itmodifies table structure to add a primary key constraint.

NEW QUESTION # 40
......

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Desktop-Based WGU Data-Management-Foundations Practice Test

WGU Online Data-Management-Foundations Test: WGU Data Management – Foundations Exam - PassLeader Help you Prepare Exam Easily

WGU Data Management – Foundations Exam Sample Questions (Q35-Q40):

Online Data-Management-Foundations Test - WGU First-grade Reliable Data-Management-Foundations Study Materials Pass Guaranteed

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