Valid Data-Management-Foundations Practice Questions, Valid Exam Data-Management-Foundations Braindumps
Valid Data-Management-Foundations Practice Questions, Valid Exam Data-Management-Foundations Braindumps
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Tags: Valid Data-Management-Foundations Practice Questions, Valid Exam Data-Management-Foundations Braindumps, Data-Management-Foundations New Real Test, Latest Data-Management-Foundations Test Simulator, Data-Management-Foundations Exam Testking
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WGU Data Management – Foundations Exam Sample Questions (Q21-Q26):
NEW QUESTION # 21
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. WITH CHECK OPTION
- C. MATERIALIZED VIEW
- D. BASE TABLE
Answer: B
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 # 22
Which keyword can be used to combine two results into one table?
- A. UNION
- B. MERGE
- C. INTEGRATE
- D. CONSOLIDATE
Answer: A
Explanation:
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.
NEW QUESTION # 23
Which function is considered an aggregate function?
- A. DESC
- B. MAX
- C. TRIM
- D. ABS
Answer: B
Explanation:
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:
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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.
NEW QUESTION # 24
Which characteristic is true for non-relational databases?
- A. They are optimized for big data.
- B. They are ideal for databases that require an accurate record of transactions.
- C. They support the SQL query language.
- D. They store data in tables, columns, and rows, similar to a spreadsheet.
Answer: A
Explanation:
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.
NEW QUESTION # 25
Which action does the % operator accomplish in MySQL?
- A. Raises a numeric value to the power of another
- B. Compares two numeric values for equality
- C. Divides two numeric values and returns the remainder
- D. Subtracts a numeric value from another
Answer: C
Explanation:
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