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問題 #52
Which capability should databases maintain to simplify the use of SQL with a general-purpose language?

A. The ability to reverse results if needed
B. The query processor to deliver results
C. The storage manager to interpret low-level file-system commands
D. The use of an application programming interface

答案：D

解題說明：
Databases need to supportApplication Programming Interfaces (APIs)to enable seamless integration with general-purpose programming languageslike Python, Java, and C#. APIs likeODBC (Open Database Connectivity) and JDBC (Java Database Connectivity)allow applications to interact with databases without requiring complex SQL commands.
* Option A (Incorrect):Thestorage manageris responsible for managing low-levelfile system operations, but it does not simplify SQL integration with programming languages.
* Option B (Incorrect):The ability toreverse results(e.g., using ORDER BY DESC) is a SQL feature but is unrelated to integration with programming languages.
* Option C (Incorrect):Thequery processoroptimizes and executes SQL queries but does not provide an interface for application development.
* Option D (Correct):APIsallow databases to be accessed easily from different programming environments, simplifying integration.

問題 #53
Which keyword can be used to combine two results into one table?

A. MERGE
B. CONSOLIDATE
C. UNION
D. INTEGRATE

答案：C

解題說明：
TheUNIONkeyword in SQL is used tocombine the resultsof two or more SELECT queries into asingle result setwhile removing duplicate rows.
Example:
sql
SELECT Name FROM Employees
UNION
SELECT Name FROM Managers;
* Option A (Correct):UNION combines results from multiple queries into one set,removing duplicates.
* Option B (Incorrect):MERGE is not a valid SQL keyword for combining result sets (it is used insome database systems for data merging).
* Option C (Incorrect):INTEGRATE is not a SQL keyword.
* Option D (Incorrect):CONSOLIDATE is not an SQL keyword.

問題 #54
Which operator defines the field that the index is using in a CREATE TABLE statement?

A. ON
B. IN
C. CHECK
D. UNIQUE

答案：A

解題說明：
TheONkeyword specifies the field used by anindexwhen creating it in SQL.
Example Usage:
sql
CREATE INDEX idx_employee_name
ON Employees(Name);
* Here, an indexidx_employee_nameis createdon the Name column.
* Thisimproves query performancewhen filtering by Name.
Why Other Options Are Incorrect:
* Option B (IN) (Incorrect):Used in queries to match values in a set, not for indexing.
* Option C (UNIQUE) (Incorrect):Ensures a column has unique values but doesnot define an index field.
* Option D (CHECK) (Incorrect):Used forvalidating column values, not for indexing.
Thus, the correct answer isON, as it defines thecolumn on which an index is created.

問題 #55
Which characteristic is true for non-relational databases?

A. They store data in tables, columns, and rows, similar to a spreadsheet.
B. They are ideal for databases that require an accurate record of transactions.
C. They support the SQL query language.
D. They are optimized for big data.

答案：D

解題說明：
Non-relational databases(also calledNoSQL databases) are designed for handlingbig dataandunstructured dataefficiently. They are optimized forhorizontal scaling, making them ideal forlarge-scale distributed systems.
* Option A (Correct):Non-relational databases areoptimized for big data, handling massive volumes of data across distributed architectures.
* Option B (Incorrect):NoSQL databases donotuse SQL as their primary query language. They often use JSON-based queries (e.g., MongoDB).
* Option C (Incorrect):Transaction-heavy applications requireACID compliance, which relational databases (SQL) handle better than NoSQL databases.
* Option D (Incorrect):NoSQL databases usedocument, key-value, graph, or column-family storage models, nottables, columns, and rowslike relational databases.

問題 #56
Which function is considered an aggregate function?

A. MAX
B. DESC
C. ABS
D. TRIM

答案：A

解題說明：
Aggregate functionsperform calculationson a set of values and return asingle result.MAX()is one such function, returning thelargest value in a column.
Common Aggregate Functions:
A screenshot of a computer AI-generated content may be incorrect.

Example Usage:
sql
SELECT MAX(Salary) FROM Employees;
* Retrieves thehighest salaryin the Employees table.
Why Other Options Are Incorrect:
* Option B (TRIM) (Incorrect):Removes spaces from strings butis not an aggregate function.
* Option C (ABS) (Incorrect):Returns theabsolute value of a numberbut doesnot aggregate multiple rows.
* Option D (DESC) (Incorrect):Used in ORDER BY forsorting in descending order,not for aggregation.
Thus, the correct answer isMAX(), as it is atrue aggregate function.

問題 #57
......

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最新版的Data-Management-Foundations參考資料，WGU Courses and Certificates認證Data-Management-Foundations考試題庫提供免費下載

最好的WGU Data-Management-Foundations參考資料會幫您一次嘗試就通過你的WGU Data-Management-Foundations考試

最新的 Courses and Certificates Data-Management-Foundations 免費考試真題 (Q52-Q57):

最好的Data-Management-Foundations參考資料擁有模擬真實考試環境與場境的軟件VCE版本＆精準的Data-Management-Foundations：WGU Data Management – Foundations Exam

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