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WGU Data Management – Foundations Exam Sample Questions (Q51-Q56):

NEW QUESTION # 51
Which type of join selects all the rows from both the left and right table, regardless of match?

• A. Inner Join
• B. Outer Join
• C. Cross Join
• D. Full Join

Answer: D

Explanation:
AFull Join (FULL OUTER JOIN)selectsall records from both tables, filling in NULL values where there is no match. This ensures that no data is lost from either table.
Example Usage:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
FULL OUTER JOIN Departments ON Employees.DeptID = Departments.ID;
* This query retrievesall employees and all departments, even if an employeehas no assigned departmentor a departmenthas no employees.
Types of Joins:
* FULL OUTER JOIN (Correct Answer)# Includesall rows from both tables, filling missing values with NULL.
* LEFT JOIN (Incorrect)# Includesall rows from the left tableandmatching rows from the right table.
* RIGHT JOIN (Incorrect)# Includesall rows from the right tableandmatching rows from the left table.
* CROSS JOIN (Incorrect)# Produces aCartesian product(each row from one table is combined with every row from another table).
Thus, the correct answer isFULL JOIN, whichensures that all rows from both tables appear in the result.

NEW QUESTION # 52
Which relationship is shown in the following diagram?

• A. Unary relationship
• B. Many-to-many
• C. Intersection data
• D. Associative entity

Answer: A

Explanation:
The given diagram represents a unary relationship (also called a recursive relationship), which occurs when an entity is related to itself. In this case, salespersons back each other up, meaning a salesperson is associated with another salesperson from the same entity.
Key Observations from the Diagram:
* Single Entity (Salesperson)
* The table contains only one entity type, Salesperson, which has attributes such as Salesperson Number, Name, Commission, Percentage, and Year of Hire.
* Self-Referencing Relationship (Backs-up and Backed-up by)
* The diagram shows that a salesperson can back up another salesperson.
* This means that the relationship exists within the same entity rather than between two different entities.
* Cardinality (One-to-One Relationship in a Unary Form)
* The notation ( |-| ) in the ER diagram indicates a one-to-one recursive relationship.
* One salesperson can back up only one other salesperson, and each salesperson is backed up by only one.

NEW QUESTION # 53
How many bytes of storage does a BIGINT data type hold in MySQL?

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

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