What is a database schema? MCQ with Answer and Explanation

Question
What is a database schema?
A. The overall design or structure of the database, including tables, columns, and relationships
B. A single table
C. A backup file
D. A query result
Answer: Option A
Solution (By JKSSB Mock Tests)
A schema is the logical description of the entire database, defining tables, views, indexes, and constraints.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
What is a candidate key?
A. A foreign key
B. A set of columns that uniquely identifies a row and can serve as a primary key
C. A column that can be used as a primary key but is not chosen
D. A column that allows duplicate values
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Correct Answer: Option B

Explanation:
A candidate key is an attribute or set of attributes that can uniquely identify a tuple; one is selected as the primary key.
This question belongs to: Computer Database Management System (DBMS)
Question #2
What is the purpose of a database index?
A. To define relationships
B. To store large objects
C. To speed up data retrieval operations
D. To enforce uniqueness
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Correct Answer: Option C

Explanation:
Indexes are primarily used to improve the speed of data retrieval, particularly for search queries.
This question belongs to: Computer Database Management System (DBMS)
Question #3
Which level of database architecture defines the entire logical structure of the database, including entities, relationships, and constraints, independent of physical storage?
A. View Level
B. Conceptual Level
C. Physical Level
D. Internal Level
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Correct Answer: Option B

Explanation:
The Conceptual (or Logical) level describes what data is stored in the entire database and what relationships exist among those data points.
This question belongs to: Computer Database Management System (DBMS)
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