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WGU Data Management – Foundations Exam Sample Questions (Q23-Q28):
NEW QUESTION # 23
Which database operation locates the needed table blocks?
Answer: A
Explanation:
Anindex scanis a database operation thatquickly locates table blocksusing anindexrather than scanning the entire table. It significantly improves query performance.
Example Usage:
sql
SELECT * FROM Employees WHERE EmployeeID = 105;
* If EmployeeID isindexed, the database uses anindex scantoquickly find the record.
Why Other Options Are Incorrect:
* Option A (Binary search) (Incorrect):A searching algorithm, but not a database operation.
* Option B (Table scan) (Incorrect):Scans theentire table, which isslowerthan an index scan.
* Option C (Fan-out) (Incorrect):Refers tobranching in B-Treesbut doesnot locate table blocks directly.
Thus, the correct answer isIndex scan, as it efficiently locates table blocks.
NEW QUESTION # 24
Which keyword can be used to combine two results into one table?
Answer: D
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 # 25
Which keyword or clause indicates the desired sequence when displaying a set of records returned from a SELECT statement?
Answer: C
Explanation:
TheORDER BYclause in SQL is used tosort query resultsinascending (ASC) or descending (DESC) order
.
Example Usage:
sql
SELECT Name, Salary FROM Employees ORDER BY Salary DESC;
* This retrieves all employees, sorted bysalary in descending order.
Why Other Options Are Incorrect:
* Option A (BETWEEN) (Incorrect):Used for filtering ranges butdoes not order results.
* Option B (DISTINCT) (Incorrect):Removes duplicate rows butdoes not control order.
* Option D (LIKE) (Incorrect):Used forpattern matching, not sorting.
Thus,ORDER BY is the correct choicefor defining the sequence of query results.
NEW QUESTION # 26
How is the primary key indicated in a table?
Answer: A
Explanation:
In SQL, aprimary key is explicitly defined using the PRIMARY KEY keywordwhen creating a table.
Example Usage:
sql
CREATE TABLE Products (
ProductID INT PRIMARY KEY,
Name VARCHAR(100),
Price DECIMAL(10,2)
);
* Here,PRIMARY KEY is the SQL keyword that designates ProductID as the primary key.
Why Other Options Are Incorrect:
* Option A (Formula in SQL) (Incorrect):SQLdoes not use formulas to define primary keys.
* Option C (Bold typeface) (Incorrect):SQL syntax does not rely on text formatting.
* Option D (Diamond symbol) (Incorrect):ER diagramsmight use symbols, but SQLdoes not use diamonds to indicate keys.
Thus, the correct answer isSQL keyword, as primary keys are explicitly defined using PRIMARY KEY.
NEW QUESTION # 27
Which clause is used to specify the join columns when performing a join in MySQL?
Answer: B
Explanation:
When performing aJOIN operationin MySQL, the ON clause specifies thejoining condition, defining which columns from both tables should be matched.
Example:
sql
SELECT Employees.Name, Departments.DepartmentName
FROM Employees
JOIN Departments ON Employees.DepartmentID = Departments.ID;
* Option A (Incorrect):AS is used foraliasing tables and columns, not for specifying join conditions.
* Option B (Incorrect):JOIN defines the type of join (INNER JOIN, LEFT JOIN, etc.), butdoes not specify the columns.
* Option C (Correct):The ON clause is used tospecify the join conditionbetween two tables.
* Option D (Incorrect):AND is used in filtering conditions, not for joining tables.
NEW QUESTION # 28
......
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