Data-Management-Foundations Practice Exam Questions - Data-Management-Foundations Training Kit
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WGU Data Management – Foundations Exam Sample Questions (Q27-Q32):
NEW QUESTION # 27
Which keyword can be used to combine two results into one table?
Answer: B
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 # 28
What is the last step in the logical design process for designing a database?
Answer: C
Explanation:
Thelogical design phasein database development focuses onstructuring data efficientlyto eliminate redundancy and ensure integrity. Thefinal step in logical designis toapply normalization (normal forms)to optimize the database schema.
Steps in Logical Database Design:
* Discover entities# Identify real-world objects (e.g., Customers, Orders).
* Determine cardinality# Define relationships between entities (one-to-one, one-to-many).
* Analyze data requirements# Determine the attributes each entity needs.
* Apply normal forms# Eliminate redundancy and improve data consistency.
Example Usage:
* After identifying entities likeStudentsandCourses, applying3rd Normal Form (3NF)ensures that data isorganized without redundancy.
Why Other Options Are Incorrect:
* Option A (Analyze data requirements) (Incorrect):Doneearlierto define attributes.
* Option C (Determine cardinality) (Incorrect):Donebeforenormalization to establish relationships.
* Option D (Discover entities) (Incorrect):Done at thebeginningof database design.
Thus, the correct answer isApply a normal form, as normalization is thelast step in logicaldesign.
NEW QUESTION # 29
Which operation finds an entry containing a search value by repeatedly splitting the index in two?
Answer: D
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 # 30
What is the role of the transaction manager within the database system architecture?
Answer: C
Explanation:
ATransaction ManagerensuresACID (Atomicity, Consistency, Isolation, Durability)properties in database transactions. It manages concurrent transactions, ensuring no conflicts occur and logs modifications to support recovery mechanisms.
* Option A (Incorrect):Query optimization is managed by thequery processor, not the transaction manager.
* Option B (Incorrect):The transaction manager is a component of the database architecture but is not composed of the entire system (query processor, storage manager, etc.).
* Option C (Correct):The transaction manager logs transactions like INSERT, UPDATE, and DELETE, ensuring consistency and recoverability.
* Option D (Incorrect):Thestorage manageris responsible for translating queries into filesystem commands.
NEW QUESTION # 31
Which primary key values consist of a single field only?
Answer: A
Explanation:
Asimple primary keyconsists ofonly one columnthat uniquely identifies each row in a table.
Example Usage:
sql
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50)
);
* StudentIDis asimple primary keybecause it consists of only one field.
Why Other Options Are Incorrect:
* Option B (Partition) (Incorrect):Refers topartitioned tables, which divide data for performance reasons butare not related to primary keys.
* Option C (Stable) (Incorrect):This is not a recognized term in database keys.
* Option D (Meaningless) (Incorrect):Primary keys are oftenmeaningless (e.g., auto-incremented IDs)
, but this isnot a term used to describe their structure.
Thus, the correct answer isSimple, as asingle-field primary keyis referred to as asimple primary key.
NEW QUESTION # 32
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