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使用Data-Management-Foundations學習筆記意味著你已經通過WGU Data Management–Foundations Exam的一半

一般的WGU認證考試是Data-Management-Foundations專家利用專業經驗研究出來的考試題和答案。而Testpdf正好有這些行業專家為你提供這些考試練習題和答案來幫你順利通過考試。我們的Testpdf提供的考試練習題和答案有100%的準確率。購買了Testpdf的產品你就可以很容易地獲得WGU的認證證書，這樣你在WGU行業中又有了個非常大的提升。

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最新的 Courses and Certificates Data-Management-Foundations 免費考試真題 (Q10-Q15):

問題 #10
Which keyword can be used as a clause in an ALTER TABLE statement?

• A. DELETE
• B. CHANGE
• C. STOP
• D. AGGREGATE

答案：B

解題說明：
TheALTER TABLEstatement is used to modify an existing database table structure. One common clause is CHANGE, which allows renaming a column and modifying its data type.
Example:
sql
ALTER TABLE Employees CHANGE COLUMN OldName NewName VARCHAR(50);
* Option A (Incorrect):DELETE is used to removerows, not alter table structure.
* Option B (Correct):CHANGE is avalid clausefor renaming and modifying columns in MySQL and some other databases.
* Option C (Incorrect):STOP is not a valid SQL keyword for altering tables.
* Option D (Incorrect):AGGREGATE refers to functions like SUM() and AVG(), not table alterations.

問題 #11
What is the role of a query processor in the database system architecture?

• A. It writes log records before applying changes to the database.
• B. It uses information from the catalog to perform query optimization.
• C. It translates instructions into file system commands.
• D. It sends results back to the application that requested the queries.

答案：B

解題說明：
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 the transaction 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.

問題 #12
Which action does the % operator accomplish in MySQL?

• A. Subtracts a numeric value from another
• B. Compares two numeric values for equality
• C. Divides two numeric values and returns the remainder
• D. Raises a numeric value to the power of another

答案：C

解題說明：
The % operator in MySQL is known as themodulus operator. It returns theremainderof a division operation between two numbers.
Example:
sql
SELECT 10 % 3; -- Output: 1 (10 divided by 3 gives remainder 1)
* Option A (Incorrect):Raising a number to a power is done using the POW() function or