WGU Data-Management-Foundations Exam With Confidence Using Practice Dumps

Aquery processoris responsible forquery optimization and executionin a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.

Option A (Correct):Thequery processoroptimizes queries by analyzing metadata from thesystem catalogto determine the best execution strategy.

Option B (Incorrect):Logging transactionsbefore applying changes is the responsibility of thetransaction manager.

Option C (Incorrect):Translating instructions intofile system commandsis handled by thestorage manager, not the query processor.

Option D (Incorrect):While the query processor helps retrieve results, thedatabaseengineandAPI layerare responsible for returning results to applications.

Avalid SELECT statementin SQL follows this basic syntax:

sql

SELECT column1, column2

FROM table_name

WHERE condition;

The correct optionDfollows this syntaxcorrectly.

Why Other Options Are Incorrect:

Option A (Incorrect):SQL does not usedouble quotes(") around column/table names unless explicitly required in some databases.

Option B (Incorrect):The WHERE clausemust appear after the FROM clause.

Option C (Incorrect):ALL isnota valid keyword in standard SQL queries.

Thus,Option Dfollows the correct SQL syntax.

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 doesnotreject 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.