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Quiz 2025 WGU Data-Management-Foundations: WGU Data Management–Foundations Exam Accurate New Study Notes

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WGU Data Management – Foundations Exam Sample Questions (Q19-Q24):

NEW QUESTION # 19
Which primary key values consist of a single field only?

• A. Meaningless
• B. Simple
• C. Stable
• D. Partition

Answer: B

Explanation:
Asimple primary keyconsists ofonly one columnthat uniquely identifies each row in a table.
Example Usage:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* StudentIDis asimple primary keybecause it consists of only one field.
Why Other Options Are Incorrect:
* Option B (Partition) (Incorrect):Refers topartitioned tables, which divide data for performance reasons butare not related to primary keys.
* Option C (Stable) (Incorrect):This is not a recognized term in database keys.
* Option D (Meaningless) (Incorrect):Primary keys are oftenmeaningless (e.g., auto-incremented IDs)
, but this isnot a term used to describe their structure.
Thus, the correct answer isSimple, as asingle-field primary keyis referred to as asimple primary key.

NEW QUESTION # 20
Which function measures a numeric value's distance from 0?

• A. ABS
• B. LOWER
• C. FROM
• D. CONCAT

Answer: A

Explanation:
TheABS()function in SQL returns theabsolute valueof a given number, effectively measuring itsdistance from zero.
Example Usage:
sql
SELECT ABS(-50), ABS(50);
Result:
50 | 50
* This function ensures that numbers arealways positive, regardless of their original sign.
Why Other Options Are Incorrect:
* Option A (CONCAT) (Incorrect):Used tocombine strings(not numbers).
* Option B (LOWER) (Incorrect):Converts text tolowercase, not numerical operations.
* Option C (FROM) (Incorrect):Part of SELECT FROM queries,not a function.
Thus, the correct choice isABS(), which computes the absolute value of a number.

NEW QUESTION # 21
Which action does the % operator accomplish in MySQL?

• A. Divides two numeric values and returns the remainder
• B. Subtracts a numeric value from another
• C. Compares two numeric values for equality
• D. Raises a numeric value to the power of another

Answer: A

Explanation:
The % operator in MySQL is known as themodulus operator. It returns theremainderof a division operation between two numbers.
Example:
sql
SELECT 10 % 3; -- Output: 1 (10 divided by 3 gives remainder 1)
* Option A (Incorrect):Raising a number to a power is done using the POW() function or