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Free PDF Quiz First-grade WGU Data-Management-Foundations - Test WGU Data Management–Foundations Exam Simulator
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WGU Data Management – Foundations Exam Sample Questions (Q26-Q31):
NEW QUESTION # 26
Which term defines a column, or group of columns, that refers to a primary key in a different table?
- A. Foreign key
- B. Super key
- C. Simple key
- D. Composite key
Answer: A
Explanation:
Aforeign keyis a column (or a set of columns) that establishes arelationship between two tablesby referencing theprimary key of another table.
Example Usage:
sql
CREATE TABLE Departments (
DeptID INT PRIMARY KEY,
DeptName VARCHAR(50)
);
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
DeptID INT,
FOREIGN KEY (DeptID) REFERENCES Departments(DeptID)
);
* DeptID in Employees is a foreign key, referencing DeptID in Departments.
* Ensuresreferential integrity# DeptID in Employeesmust existin Departments.
Why Other Options Are Incorrect:
* Option A (Super key) (Incorrect):Asuper keyis any set of columns that uniquely identifies a row, but itdoes not reference another table.
* Option B (Simple key) (Incorrect):Asimple keyis asingle-column primary key, not a reference to another table.
* Option C (Composite key) (Incorrect):Acomposite keyconsists ofmultiple columnsbut does not necessarily reference another table.
Thus, the correct answer isForeign key, as it establishes aconnection between two tables.
NEW QUESTION # 27
Which statement uses valid syntax for the DELETE statement in SQL?
- A. DELETE table_name WHERE condition;
- B. DELETE FROM table_name;
- C. DELETE FROM table_name WHERE condition;
- D. DELETE * FROM table_name WHERE condition;
Answer: C
Explanation:
Thecorrect syntaxfor deleting records from a table in SQL is:
sql
DELETE FROM table_name WHERE condition;
This deletesonly the rowsthat match the condition.
Example Usage:
sql
DELETE FROM Employees WHERE Salary < 30000;
* Deletesall employees earning less than $30,000.
Why Other Options Are Incorrect:
* Option A (Incorrect):Missing FROMkeyword. The correct syntax is DELETE FROM table_name.
* Option C (Partially Correct):DELETE FROM table_name;deletes all rows, but it lacks a WHERE clause.
* Option D (Incorrect):DELETE *is not validin SQL. The correct command is just DELETE FROM.
Thus, the correct answer isDELETE FROM table_name WHERE condition;.
NEW QUESTION # 28
Which product has an open-source license in addition to having a non-relational system?
- A. MongoDB
- B. MySQL
- C. SQL Server
- D. Oracle Database
Answer: A
Explanation:
MongoDB is aNoSQL (non-relational) databasethat isopen-sourceand supportsdocument-oriented storage
. It allows for flexible schema design and is optimized for big data applications.
* Option A (Correct):MongoDB is aNoSQL databasewith an open-sourceAGPLlicense, making it both free to use and non-relational.
* Option B (Incorrect):SQL Serveris arelational database(RDBMS) developed by Microsoft and isnot open-source.
* Option C (Incorrect):MySQLisopen-sourcebut is arelational database(RDBMS), not a NoSQL system.
* Option D (Incorrect):Oracle Databaseisrelationalandproprietary(not open-source).
NEW QUESTION # 29
Which keyword determines if a value is within a range of values?
- A. OR
- B. IN
- C. LIKE
- D. BETWEEN
Answer: D
Explanation:
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.
NEW QUESTION # 30
Which command is used to filter group results generated by the GROUP BY clause?
- A. WHERE
- B. WITH
- C. HAVING
- D. REPLACE
Answer: C
Explanation:
TheHAVINGclause is used in SQL to filtergrouped resultsgenerated by the GROUP BY clause. Unlike WHERE, which filters individual rowsbeforegrouping, HAVING filtersafter aggregationhas been performed.
Example Usage:
sql
SELECT Department, AVG(Salary) AS AvgSalary
FROM Employees
GROUP BY Department
HAVING AVG(Salary) > 50000;
* This query first groups employees by Department, calculates theaverage salary per department, and then filters onlythose departments where the average salary is greater than 50,000.
Why Other Options Are Incorrect:
* Option A (REPLACE) (Incorrect):Used for string substitution, not filtering.
* Option C (WITH) (Incorrect):Used inCommon Table Expressions (CTEs), not for filtering.
* Option D (WHERE) (Incorrect):Used forrow-level filtering before aggregation, but itcannot be used on aggregate functions like SUM() or AVG().
Thus,HAVING is the correct answerfor filtering after grouping.
NEW QUESTION # 31
......
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