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WGU Data Management – Foundations Exam Sample Questions (Q14-Q19):
NEW QUESTION # 14
What is the role of the database administrator?
- A. The database administrator is responsible for securing the database system against unauthorized users.
- B. The database administrator determines the format of each data element and the overall database structure.
- C. The database administrator is a consumer of data in a database.
- D. The database administrator develops computer programs that utilize a database.
Answer: A
Explanation:
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.
NEW QUESTION # 15
What is the first step of the analysis phase for designing a database?
- A. Identify entities
- B. Determine cardinality
- C. Implement attributes
- D. Draw an entity-relationship (ER) diagram
Answer: A
Explanation:
Thefirst stepin database analysis isidentifying entities, which are thereal-world objectsthat need to be represented in the database.
Example Usage:
* In a school system, the mainentitiescould be:
Students, Courses, Instructors
Why Other Options Are Incorrect:
* Option A (Determine cardinality) (Incorrect):Determining relationships comesafteridentifying entities.
* Option C (Draw an ER diagram) (Incorrect):ER diagramsvisualizeentities but arenot the first step.
* Option D (Implement attributes) (Incorrect):Attributes aredefined afterentities are identified.
Thus, the correct answer isIdentify entities, asentities form the foundation of the databasemodel.
NEW QUESTION # 16
Which expression can be used to create a temporary name for a table?
- A. HAVING
- B. UNION
- C. NEW
- D. ALIAS
Answer: D
Explanation:
Analiasis used in SQL to give atemporaryname to a table or column within a query. It makes queries more readable and helps in cases where a table needs to be referenced multiple times (e.g., in aself-join).
Example Usage:
sql
SELECT e.Name, d.DepartmentName
FROM Employees AS e
JOIN Departments AS d
ON e.DeptID = d.ID;
* Here,Employees is aliased as eandDepartments as d, making the query shorter and clearer.
Why Other Options Are Incorrect:
* Option A (HAVING) (Incorrect):Used to filter grouped results, not create aliases.
* Option B (NEW) (Incorrect):Not a valid SQL keyword for aliasing.
* Option D (UNION) (Incorrect):Combines result sets but does not rename tables.
Thus, the correct answer isALIAS, which allows fortemporary naming of tables or columns.
NEW QUESTION # 17
Which optional clause is used to reject inserts and updates that do not satisfy the WHERE clause of a view query?
- A. JOIN VIEWS
- B. BASE TABLE
- C. MATERIALIZED VIEW
- D. WITH CHECK OPTION
Answer: D
Explanation:
When a VIEW is created in SQL, users mayinsert or updatedata through that view. However, if a row is inserted or updated in such a way that itviolates the conditionof the VIEW's WHERE clause, it can lead to inconsistencies.
Topreventsuch unwanted modifications,SQL provides the WITH CHECK OPTION clause.
How WITH CHECK OPTION Works:
* Ensures thatany new data (INSERT/UPDATE) still fits within the defined constraints of the VIEW.
* If a user tries to insert or update a row that would not appear in the VIEW,the operation isrejected.
Example:
sql
CREATE VIEW HighSalaryEmployees AS
SELECT * FROM Employees WHERE Salary > 50000
WITH CHECK OPTION;
Now, if someone attempts:
sql
INSERT INTO HighSalaryEmployees (ID, Name, Salary)
VALUES (101, 'Alice', 30000);
Thisfailsbecause 30000 does not satisfy Salary > 50000.
Why Other Options Are Incorrect:
* Option B (Incorrect):JOIN VIEWS isnot a valid SQL clause.
* Option C (Incorrect):MATERIALIZED VIEW refers tostored viewsin some databases, but it doesnot reject incorrect inserts/updates.
* Option D (Incorrect):BASE TABLE refers to theoriginal table from which a VIEW is created.
Thus, the correct answer is WITH CHECK OPTION, whichensures that only valid data modifications occur.
NEW QUESTION # 18
Which product has an open-source license in addition to having a non-relational system?
- A. SQL Server
- B. Oracle Database
- C. MongoDB
- D. MySQL
Answer: C
Explanation:
MongoDB is aNoSQL (non-relational) databasethat isopen-sourceand supportsdocument-oriented storage
. It allows for flexible schema design and is optimized for big data applications.
* Option A (Correct):MongoDB is aNoSQL databasewith an open-sourceAGPLlicense, making it both free to use and non-relational.
* Option B (Incorrect):SQL Serveris arelational database(RDBMS) developed by Microsoft and isnot open-source.
* Option C (Incorrect):MySQLisopen-sourcebut is arelational database(RDBMS), not a NoSQL system.
* Option D (Incorrect):Oracle Databaseisrelationalandproprietary(not open-source).
NEW QUESTION # 19
......
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