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Real Data-Management-Foundations Question, Data-Management-Foundations Latest Exam Pdf

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WGU Data Management – Foundations Exam Sample Questions (Q20-Q25):

NEW QUESTION # 20
Which keyword can be used to combine two results into one table?

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

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 # 21
What is the role of the transaction manager within the database system architecture?

A. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
B. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
C. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
D. The transaction manager uses information from the catalog to perform query optimization.

Answer: C

NEW QUESTION # 22
Which designation is an individual value, such as a salary?

A. Glossary
B. Attribute type
C. Relationship
D. Entity type

Answer: B

Explanation:
Anattribute typerefers to asingle, specific valuewithin a table, such as Salary, Age, or Price.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50),
Salary DECIMAL(10,2)
);
* Salary is anattribute typewith individual values for each employee.
Why Other Options Are Incorrect:
* Option A (Glossary) (Incorrect):Refers todocumentation, not database values.
* Option B (Entity type) (Incorrect):Representsa class of objects(e.g., Employees), not individual values.
* Option D (Relationship) (Incorrect):Definesconnections between entities, not attributes.
Thus, the correct answer isAttribute type, as it represents anindividual data value.

NEW QUESTION # 23
Which operation finds an entry containing a search value by repeatedly splitting the index in two?

A. Binary search
B. Fan-out
C. Table scan
D. Index scan

Answer: A

Explanation:
Binary searchis an algorithm that finds a search value byrepeatedly dividing the search space into two halves. It is commonly used inindexed searches.
Example Usage in Databases:
* B-Trees and B+ Trees(used in database indexing) applybinary searchto navigate the index efficiently.
* If searching for ID = 50 in asorted list of IDs, binary search:
* Splits the list into two halves.
* Checks the middle value.
* Eliminates half of the dataset.
* Repeats until the value is found.
Why Other Options Are Incorrect:
* Option A (Table scan) (Incorrect):Readsevery row,much slowerthan binary search.
* Option C (Index scan) (Incorrect):Uses indexes but does not necessarily apply binary search.
* Option D (Fan-out) (Incorrect):Describesbranching in B-Trees, not searching.
Thus, the correct answer isBinary search, as it repeatedlysplits the indexin two.

NEW QUESTION # 24
What does the aggregate function do?

A. It lists combinations of rows in two tables.
B. It computes values over a set of rows.
C. It selects rows that appear in one table but not another.
D. It eliminates one or more columns of a table.

Answer: B

Explanation:
Anaggregate functionperforms acalculation over multiple rowsand returns asingle value. Examples include SUM(), AVG(), MAX(), MIN(), and COUNT()in SQL.
* Option A (Correct):Aggregate functions compute values over aset of rows, like summingtotal sales or averaging grades.
* Option B (Incorrect):Selecting rows that appear in one table but not another is done usingset operations (EXCEPT or MINUS in SQL).
* Option C (Incorrect):Eliminating columns is done using thePROJECToperation orSELECT with specific columns.
* Option D (Incorrect):Combining rows from two tables refers to aJOIN operation, not aggregation.

NEW QUESTION # 25
......

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