New Data-Management-Foundations Exam Test | Data-Management-Foundations Practice Mock
New Data-Management-Foundations Exam Test | Data-Management-Foundations Practice Mock
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WGU Data Management – Foundations Exam Sample Questions (Q41-Q46):
NEW QUESTION # 41
Which relationship is shown in the following diagram?
- A. Unary relationship
- B. Many-to-many
- C. Associative entity
- D. Intersection data
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 # 42
Which SQL command uses the correct syntax to add a new employee "John Doe" to the Employee table?
- A. INSERT Employee (Name) Values ("John Doe");
- B. INSERT Employee { "John Doe" };
- C. INSERT INTO Employee (Name) VALUES ("John Doe");
- D. INSERT INTO Employee ("John Doe");
Answer: C
Explanation:
Thecorrect syntaxfor inserting a new row into a table follows this structure:
Standard SQL INSERT Syntax:
sql
INSERT INTO TableName (Column1, Column2, ...)
VALUES (Value1, Value2, ...);
For this scenario:
sql
INSERT INTO Employee (Name) VALUES ('John Doe');
Why Other Options Are Incorrect:
* Option A (Incorrect):Uses incorrect syntax { ... }, which isnot valid SQL syntax.
* Option C (Incorrect):Does not specify the column name, whichcauses an error.
* Option D (Incorrect):Misses theINTOkeyword, which is required in standard SQL.
Thus, the correct syntax isOption B, ensuring aproperly formatted insert statement.
NEW QUESTION # 43
How many bytes of storage does a BIGINT data type hold in MySQL?
- A. 3 bytes
- B. 1 byte
- C. 8 bytes
- D. 4 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