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Study Data-Management-Foundations Test - Data-Management-Foundations Interactive EBook

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WGU Data Management – Foundations Exam Sample Questions (Q11-Q16):

NEW QUESTION # 11
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. MATERIALIZED VIEW
C. WITH CHECK OPTION
D. BASE TABLE

Answer: C

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 # 12
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?

A. FROM
B. VALUE
C. TABLE
D. WHERE

Answer: A

Explanation:
InSQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.
Example:
sql
SELECT name, salary FROM Employees;
* Option A (Correct):The FROM clauseimmediately followsthe SELECT clause in MySQL.
* Option B (Incorrect):VALUE is not a valid clause in MySQL SELECT statements.
* Option C (Incorrect):WHERE is used to filter recordsafter specifying the table in FROM.
* Option D (Incorrect):TABLE is not a valid clause following SELECT in SQL.

NEW QUESTION # 13
Which keyword combines INSERTS, UPDATES, and DELETES operations into a single statement?

A. JOIN
B. MERGE
C. INTO
D. DROP

Answer: B

Explanation:
TheMERGEstatement, also known asUPSERT, combinesINSERT, UPDATE, and DELETEoperations into asingle statementbased on a given condition. It is commonly used indata warehouses and large-scale databases.
Example Usage:
sql
MERGE INTO Employees AS Target
USING NewEmployees AS Source
ON Target.ID = Source.ID
WHEN MATCHED THEN
UPDATE SET Target.Salary = Source.Salary
WHEN NOT MATCHED THEN
INSERT (ID, Name, Salary) VALUES (Source.ID, Source.Name, Source.Salary);
* If a match is found, the UPDATE clause modifies the existing record.
* If no match is found, the INSERT clause adds a new record.
Why Other Options Are Incorrect:
* Option A (INTO) (Incorrect):Used in INSERT INTO, butdoes not combine operations.
* Option B (JOIN) (Incorrect):Used to combine rows from multiple tables, butnot for merging data.
* Option D (DROP) (Incorrect):Deletes database objects liketables, views, and indexes, butdoes not merge data.
Thus, the correct answer isMERGE, as itcombines inserts, updates, and deletes into a single operation.

NEW QUESTION # 14
Which elements are represented by attributes in the database design documents?

A. Relationships
B. Names
C. Synonyms
D. Repositories

Answer: B

Explanation:
Attributesin a databaserepresent the properties (names, values, or characteristics) of an entity.
Example Usage:
* In aStudentstable, attributes might include:
StudentID (Primary Key), Name, Age, Major
* Here,Name is an attributedescribing the entityStudent.
Why Other Options Are Incorrect:
* Option A (Synonyms) (Incorrect):Synonyms in SQL allow different names for the same object but are not attributes.
* Option C (Repositories) (Incorrect):A repository stores data butdoes not define attributes.
* Option D (Relationships) (Incorrect):Relationships defineconnections between entities, not their attributes.
Thus, the correct answer isNames, asattributes define entity properties.

NEW QUESTION # 15
Which term refers to a path from a top-level block to a bottom-level block?

A. Fan-out
B. Crow's foot
C. Sparse index
D. Branch

Answer: D

Explanation:
In database indexing, abranchrefers to thepath from the top-level block (root node) to a bottom-level block (leaf node)in aB-Tree or B+ Tree index structure.
Example Usage in Indexing:
* AB-Tree indexorganizes data hierarchically, withbranches leading to different parts of the tree.
* When searching for a record, thequery follows a branchfrom theroot node down to the correct leaf node.
Why Other Options Are Incorrect:
* Option A (Fan-out) (Incorrect):Refers tohow many children a node has, not the path.
* Option B (Crow's foot) (Incorrect):Anotation used in ER diagrams, not indexing.
* Option D (Sparse index) (Incorrect):A type of indexstoring only some entries, not the path itself.
Thus, the correct answer isBranch, as it defines thepath from top to bottom in a database index.

NEW QUESTION # 16
......

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Arthur Gray Arthur Gray

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