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WGU Data Management – Foundations Exam 認定 Data-Management-Foundations 試験問題 (Q40-Q45):
質問 # 40
Which syntax feature classifies the explicit string, numeric, or binary values used in SQL queries?
正解:A
解説:
In SQL,literalsrepresent explicit values such asnumbers, strings, or binary datadirectly written into queries.
For example:
SELECT * FROM Employees WHERE Salary > 50000;
Here, 50000 is anumeric literal.
* Option A (Correct):Literalsare explicit values used in SQL queries, such as 123, 'John Doe', and TRUE.
* Option B (Incorrect):Commentsare non-executable text used for documentation within SQL code, typically denoted by -- or /* ... */.
* Option C (Incorrect):Identifiersare names oftables, columns, or other database objects, such as EmployeeID.
* Option D (Incorrect):Keywordsare reserved words in SQL (e.g., SELECT, FROM, WHERE) that define operations and syntax.
質問 # 41
Which keyword determines if a value is within a range of values?
正解:C
解説:
TheBETWEENkeyword in SQL is used tofilter values within a specified range. It is particularly useful for numeric and date-based queries.
Syntax of BETWEEN:
sql
SELECT * FROM Employees WHERE Salary BETWEEN 50000 AND 100000;
* Retrievesall employees whose salary is between $50,000 and $100,000 (inclusive).
Why Other Options Are Incorrect:
* Option A (LIKE) (Incorrect):Used forpattern matchingwith wildcards (%, _). Example:
sql
SELECT * FROM Customers WHERE Name LIKE 'A%';
* Option B (IN) (Incorrect):Used tomatch a value in a specified set, butnot a range. Example:
sql
SELECT * FROM Employees WHERE Department IN ('HR', 'Finance', 'IT');
* Option C (OR) (Incorrect):Used forlogical conditions, but doesnot check a range. Example:
sql
SELECT * FROM Products WHERE Price < 10 OR Price > 50;
Thus, the correct choice is BETWEEN for filtering values within arange.
質問 # 42
Which function removes only the leading spaces from a string?
正解:B
解説:
TheLTRIM()function in SQL removesleading spaces(spaces at the beginning of a string) while keeping spaces at the end.
Example Usage:
sql
SELECT LTRIM(' Hello World') AS TrimmedText;
Output:
bash
'Hello World'
Why Other Options Are Incorrect:
* Option B (LEFT) (Incorrect):Used for extracting a portion of a string. Example:
sql
SELECT LEFT('Hello World', 5); -- Output: 'Hello'
* Option C (TRIM) (Incorrect):Removesboth leading and trailing spaces, not just leading ones.
Example:
sql
SELECT TRIM(' Hello World '); -- Output: 'Hello World'
* Option D (REPLACE) (Incorrect):Replaces occurrences of one substring with another but doesnot specifically remove spaces.
Thus, the correct answer isLTRIM(), which removes onlyleading spaces.
質問 # 43
Which action does the % operator accomplish in MySQL?
正解:A
解説:
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
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Head office:
Farmview Supermarket, (Level -5), Farmgate, Dhaka-1215
Corporate office:
18, Indira Road, Farmgate, Dhaka-1215
Branch Office:
109, Orchid Plaza-2, Green Road, Dhaka-1215