Which of the following database models organizes data in a tree-like upside-down structure with parent-child relationships? MCQ with Answer and Explanation

Question
Which of the following database models organizes data in a tree-like upside-down structure with parent-child relationships?
A. Object-Oriented Model
B. Network Model
C. Relational Model
D. Hierarchical Model
Answer: Option D
Solution (By JKSSB Mock Tests)
The Hierarchical Model stores data in a tree-like configuration where each child node has exactly one parent node.
This question belongs to: Computer Database Management System (DBMS)
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Question #1
What is the purpose of the SQL 'UNION' operator?
A. To aggregate data
B. To filter duplicates
C. To combine the results of two or more SELECT statements, removing duplicates
D. To join tables horizontally
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Correct Answer: Option C

Explanation:
UNION concatenates the result sets of two or more queries, eliminating duplicate rows. UNION ALL keeps duplicates.
This question belongs to: Computer Database Management System (DBMS)
Question #2
A candidate key is:
A. A minimal super key
B. A foreign key only
C. Any key with duplicates
D. Always the primary key
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Correct Answer: Option A

Explanation:
A candidate key is a minimal set of attributes that can uniquely identify a tuple.
This question belongs to: Computer Database Management System (DBMS)
Question #3
The command to modify existing records in a table is:
A. ALTER
B. MODIFY
C. UPDATE
D. CHANGE
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Correct Answer: Option C

Explanation:
UPDATE is the DML command used to modify data in existing rows.
This question belongs to: Computer Database Management System (DBMS)
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