WGU Data-Management-Foundations PDF Questions - Accessible On Any Device
WGU Data-Management-Foundations PDF Questions - Accessible On Any Device
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WGU Data Management – Foundations Exam Sample Questions (Q60-Q65):
NEW QUESTION # 60
Which primary key values consist of a single field only?
- A. Stable
- B. Simple
- C. Meaningless
- 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 # 61
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