Data-Management-Foundations Interactive Practice Exam & Reliable Data-Management-Foundations Practice Materials
Data-Management-Foundations Interactive Practice Exam & Reliable Data-Management-Foundations Practice Materials
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Tags: Data-Management-Foundations Interactive Practice Exam, Reliable Data-Management-Foundations Practice Materials, Data-Management-Foundations Study Guides, Practice Test Data-Management-Foundations Pdf, Data-Management-Foundations Test Questions Answers
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Reliable Data-Management-Foundations Practice Materials, Data-Management-Foundations Study Guides
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WGU Data Management – Foundations Exam Sample Questions (Q38-Q43):
NEW QUESTION # 38
Where does a primary key traditionally appear in a table?
- A. In the table header
- B. In the first column
- C. In the last visible column
- D. In the top row
Answer: B
Explanation:
Bydatabase design conventions, theprimary key is usually placed in the first columnof a table to make it easy to identify and reference.
Example Usage:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY, -- First column (convention)
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* EmpID is placed as the first columnfor clarity and quick access.
Why Other Options Are Incorrect:
* Option A (In the table header) (Incorrect):Table headers onlydisplay column names, they do not contain values.
* Option C (In the top row) (Incorrect):Thetop row contains data, not theprimary key definition.
* Option D (In the last visible column) (Incorrect):While technically possible,placing a primary key at the endisuncommonin database design.
Thus, the correct answer isIn the first column, as this is the standard convention in relational databases.
NEW QUESTION # 39
What is information independence?
- A. An ability to interchange databases
- B. An ability to change database type
- C. An ability to change the organization of data
- D. An ability to make changes to existing queries
Answer: C
Explanation:
Information independencerefers to theseparation between data storage and data access. It allows a database'slogical structureto be modifiedwithout affecting existing applications.
Types of Information Independence:
* Logical Data Independence# Ability to change theconceptual schema(e.g., renaming columns, adding new attributes)without modifying applications.
* Physical Data Independence# Ability to change thephysical storage structure(e.g., indexing, partitioning)without affecting queries.
Example of Logical Data Independence:
* Anew columnis added to the Customers table, but existing queriesstill work without modification.
Example of Physical Data Independence:
* Data is moved to SSD storagefor performance improvement, but queriesrun the same way.
Why Other Options Are Incorrect:
* Option A (Incorrect):Changing thedatabase type(e.g., MySQL to PostgreSQL) isnotinformation independence.
* Option B (Incorrect):Making changes toqueriesis unrelated to database independence.
* Option C (Incorrect):Interchanging databases is related todata portability, notinformation independence.
Thus, the correct answer isD - An ability to change the organization of data, asinformation independence ensuresmodifications do not disrupt database operations.
NEW QUESTION # 40
How many bytes of storage does a BIGINT data type hold in MySQL?
- A. 4 bytes
- B. 1 byte
- 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