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WGU Data Management – Foundations Exam Sample Questions (Q40-Q45):

NEW QUESTION # 40
Which keyword or clause indicates the desired sequence when displaying a set of records returned from a SELECT statement?

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

Answer: C

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 # 41
How can a primary key constraint be added after the table is created?

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

Answer: A

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 # 42
What is the role of the transaction manager within the database system architecture?

• A. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
• B. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
• C. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
• D. The transaction manager uses information from the catalog to perform query optimization.

Answer: B

NEW QUESTION # 43
How many bytes of storage does a BIGINT data type hold in MySQL?

• A. 1 byte
• B. 4 bytes
• C. 8 bytes
• D. 3 bytes

Answer: C

Explanation:
In MySQL, theBIGINTdata type is a64-bit integerthat requires8 bytes (64 bits) of storage. It is used to store large numerical values beyond the range of INT (4 bytes).
* Option A (Incorrect):1 byte corresponds toTINYINT, which can store values from -128 to 127.
* Option B (Incorrect):3 bytes is not a standard integer storage size in MySQL.
* Option C (Incorrect):4 bytes corresponds toINT, which has a range of -2,147,483,648 to
2,147,483,647.
* Option D (Correct):BIGINT takes8 bytesand supports a massive range of numbers from -2

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